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Aletheia
In short, Aletheia is software for getting science published and into the hands of everyone, for free. It's a decentralised and distributed database used as a publishing platform for scientific research. So, Aletheia is software. But software without people is nothing. To comprehensively answer the question what is Aletheia, Aletheia is software surrounded by a community of people who want to change the world through open access to scientific knowledge. For a more in depth explanation, Aletheia is an Ethereum Blockchain application utilising IPFS for decentralised storage that anyone can upload documents to, download documents from, that also handles the academic peer review process. The application runs on individual PCs, all forming part of the IPFS database. This gives us an open source platform that cannot be bought out by the large publishers (and any derivitive works must also be open source) that should also be hard to take down due to the database being spread across the globe in multiple legal jurisdictions. Aletheia is designed to be a resilient platform run transparently by the community, not some black box corporation or editorial board, meaning all users can see the decisions Aletheia is making and have a stake in that decision making process if they so desire. By this nature, Aletheia is decentralised, it has no key person risk. Should the core group who invented Aletheia dissapear Aletheia won't cease to exist, it will continue to be run by the community. The community moderates content through various mechanisms (peer review, reputation scores etc.,) to ensure quality of content.
Alexis FTP (aftp)
aftp is an FTP library and a background FTP tool. The aftp tool is a good example on how to use the library. You need FTP functionality in your software? Use the aftp library!
Algart
AlgART are free software Java libraries, supporting generalized smart arrays and matrices with elements of any types (1 bit, 8/16/32/64-bit integers, 32/64-bit floating point values and any other Java types), including a wide set of of 2D-, 3D- and multidimensional image processing and other algorithms, working with arrays and matrices.

Main Features

  • The libraries use 63-bit addressing of array elements (all indexes and length are represented by 64-bit long type). So, it's theoretically possible to create and process arrays and matrices containing up to 2^63-1 (~10^19) elements of any primitive or non-primitive types, if OS and hardware can provide necessary amount of memory or disk space.
  • Memory model concept allows storing AlgART arrays in different schemes, from simple Java arrays to mapped disk files; all necessary data transfers are performed automatically while every access to an element or a block of elements.
  • Most of algorithms are based on wide usage of lazy evaluations. Typical operations, like elementwise summing or geometrical matrix transformations, are implemented via lazy views of the source array or matrix.
    • For example, you can take a multidimensional matrix, rotate it (or perform any other affine or projective transform), and then extract a submatrix from the result. All these operations will be performed virtually (not requiring time), and actual calculations will be performed only at the moment of accessing elements, usually while copying the resulting matrix to a newly created one. Moreover, in many cases the libraries will "understand" itself, that the user wants to perform rotation or another transform, and will split the matrix into suitable rectangular blocks (fitting in RAM) and choose the best algorithm for this task at the moment of copying operation.
  • The libraries contain a wide set of image processing algorithms over matrices: linear filtering, mathematical morphology, rank operations, spectral transformation (FFT), etc.
  • There is also skeletonization and measuring of binary images.
Allegro
Allegro is multi-platform game programming library for C/C++ developers distributed freely, that provides many functions for graphics, sounds, player input (keyboard, mouse and joystick) and timers. It also provides fixed and floating point mathematical functions, 3d functions, file management functions, compressed datafile and a GUI. It can also be used for other types of multimedia programming.
Alliance
Complete set of free CAD tools and portable libraries for VLSI design. It includes a VHDL compiler and simulator, logic synthesis tools, and automatic place and route tools. Advanced verification tools for functional abstraction and static timing analysis are part of the system. A complete set of portable CMOS libraries is provided, including a RAM generator, a ROM generator, and a data-path compiler.
Alogg
'alogg' is a library which makes it easier to use Ogg/Vorbis streams with Allegro. It offers facilities to decode, stream, and encode Ogg/Vorbis streams, and integrates those facilities with Allegro's datafile and sample loading routines. 'alogg' comes with a sample player, streamer, and encoder based on Allegro's sound routines.
Alpine3D
Alpine3D is a spatially distributed (surface), three dimensional (atmospheric) model for analyzing and predicting dynamics of snow-dominated surface processes in mountainous topography. It includes models for snow cover (SNOWPACK), vegetation and soil, snow transport, radiation transfer and runoff which can be enabled or disabled on demand.
Alpy
Alpy provides a Python binding to the C Allegro game programming library. This binding is mostly focused with providing a basic "raw" interface to the library, trying to preserve most of the Python API similar to the C version to ease the transition to C programmers.
Amara
Library for XML processing in Python, designed to balance the native idioms of Python with the native character of XML.
An Gramadoir
An Gramadóir is intended as a platform for the development of sophisticated natural language processing tools for languages with limited computational resources. It is currently implemented for the Irish language (Gaeilge); this is, to the best of my knowledge, the first grammar checker developed for any minority language. Ports for Afrikaans, Cornish, Esperanto, Walloon, and Welsh are currently underway. The grammar checker can be called from emacs, vim, or OpenOffice. Various components of the engine can be bootstrapped using statistical methods based on text corpora.
Anemone
Anemone is a Ruby library that makes it quick and painless to write programs that spider a website. It provides a simple DSL for performing actions on every page of a site, skipping certain URLs, and calculating the shortest path to a given page on a site. The multi-threaded design makes Anemone fast. The API makes it simple. And the expressiveness of Ruby makes it powerful.
AngelScript
The AngelCode Scripting Library, or AngelScript as it is also known, is an extremely flexible cross-platform scripting library designed to allow applications to extend their functionality through external scripts. Featuring a syntax similar to C/C++, it has been designed from the beginning to be an easy to use component, both for the application programmer and the script writer.
AntTweakBar
AntTweakBar allows programmers to quickly add a light and intuitive graphical user interface into graphic programs to interactively tweak them. It is a small and easy to use C/C++ library that can be readily integrated into OpenGL and DirectX applications. It targets graphical programs that need an easy way to tweak parameters and see the result in real-time like 3D demos, light inline game editors, small 3D applications, prototypes, debug facilities of weighter graphical programs, etc. Programmers are not required to design the graphical interface by providing coordinates or by using a visual UI editor. Controls are automatically organized following an optional given hierarchy. In most cases, only one line of code is needed to add a new variable to a tweak bar. AntTweakBar can be easily integrated with your own windowing system or with existing toolkits. Examples of integration with GLFW, SDL, GLU are provided.
Antidote
Antidote is an open source implementation of the IEEE 11073-20601 standard. It also contains the implementation of a D-Bus based 11073 manager service.
Apophenia
'Apophenia' is a statistical library for C. It provides functions on the same level as those of the typical stats package (OLS, probit, singular value decomposition, &c.) but doesn't tie the user to an ad hoc language or environment. It uses the GNU Scientific Library for number crunching and SQLite for data management, so the library itself focuses on model estimation and quickly processing data.
App
'App' is a C++ preprocessor for that accepts as input arbitrary C++ code that may contain embedded constructs for specifying algebraic data types and associated pattern matching operations, and produces as output the same code with all such constructs translated to normal C++. 'app' provides for C++ the same capabilities that functional languages have regarding algebraic types. 'Applib' is the associated runtime library that supports the core run time requirements of the translated code, and which provides additional utilities.
AppTools
The AppTools project includes a set of packages that Enthought has found useful in creating a number of applications. They implement functionality that is commonly needed by many applications
  • enthought.appscripting: Framework for scripting applications.
  • enthought.help: Provides a plugin for displaying documents and examples and running demos in Envisage Workbench applications.
  • enthought.io: Provides an abstraction for files and folders in a file system.
  • enthought.naming: Manages naming contexts, supporting non-string data types and scoped preferences.
  • enthought.permissions: Supports limiting access to parts of an application unless the user is appropriately authorised (not full-blown security).
  • enthought.persistence: Supports pickling the state of a Python object to a dictionary, which can then be flexibly applied in restoring the state of the object.
  • enthought.preferences: Manages application preferences.
  • enthought.resource: Manages application resources such as images and sounds.
  • enthought.scripting: A framework for automatic recording of Python scripts.
  • enthought.sweet_pickle: Handles class-level versioning, to support loading of saved data that exist over several generations of internal class structures.
  • enthought.template: Supports creating templatizable object hierarchies.
  • enthought.type_manager: Manages type extensions, including factories to generate adapters, and hooks for methods and functions.
  • enthought.undo: Supports undoing and scripting application commands.
Argtable
Argtable is a freely available C/C++ programmer's library for parsing the command line arguments. Having only a few functions and a simple set of rules, it is capable of handling most aspects of command line parsing and error reporting with a minimum of fuss.
Armadillo: C++ library
Armadillo is a C++ linear algebra library (matrix and vector maths) aiming towards a good balance between efficiency and ease of use while staying lean. This library is useful if C++ has been decided as the language of choice (due to speed and/or integration capabilities), rather than another language like Matlab ® or GNU Octave. Armadillo uses a delayed evaluation approach in order to combine several operations into one and reduce (or eliminate) the need for temporaries. This is accomplished through extensive use of recursive templates and template meta-programming.
Aspell Heckert gnu.tiny.png
GNU Aspell is a spell checker that can be used either as a library or as an independent spell checker. It does a much better job of coming up with possible suggestions than other English language spell checkers. Other technical enhancements over Ispell include shared memory for dictionaries and intelligent handling of personal dictionaries when more than one Aspell process is open.
Astronomical Papers Library
A C library containing theories of motion of solar system objects that have been published in various astronomical journals such as Astronomy & Astrophysics, the Astronomical Journal, and Astronimcal Papers prepared for the use of the American Ephemeris. Currently this includes such theories as Newcomb's "Tables of the Sun" and all the planets as well as the theory known as "The Improved Lunar Ephemeris".
At-spi
'at-spi' is a part of the Gnome Accessibility Project. It provides a Service Provider Interface for the Assistive Technologies available on the GNOME platform, and a library against which applications can be linked.
Atomthreads
Atomthreads is a free, lightweight, portable, real-time scheduler for embedded systems. It is targeted at systems that need only a scheduler and the usual RTOS primitives. No file system, IP stack or device drivers are included, but developers can bolt on their own as required. Atomthreads will always be a small number of C files which are easy to port to any platforms that require threading by adding a simple architecture-specific file.
Aubio
aubio is a library for audio labeling. Its features include segmenting a sound file before each of its attacks, performing pitch detection, tapping the beat and producing midi streams from live audio. The name aubio comes from 'audio' with a typo: several transcription errors are likely to be found in the results too. The aim of this project is to provide these automatic labeling features to other audio softwares. Functions can be used off-line in sound editors and software samplers, or online in audio effects and virtual instruments.
Autogen Heckert gnu.tiny.png
'AutoGen' generates program files that contain repetitive text with varied substitutions. It simplifies the maintenance of programs with large amounts of repetitive text, which is useful if several blocks of such text must be synchronized. It includes:
  • AutoOpts - automates the handling of command line, environment and config file options, including usage text, man pages, and the invoking section of an info doc
  • getdefs - extracts AutoGen definitions from stylized comments embedded in source code
  • columns - tabularizes lists for improved output appearance
  • AutoXDR - NFSv4 specifies that its remote procedure calls be batched. AutoGen generates the code for marshalling and unmarshalling the arguments on both sides of the RPC request
  • AutoFSM - produces a transition table and prototype finite state machine where it is possible to determine a state transition type (token code) without reference to the current state
  • xml2ag - lets AutoGen use any XML file as if it were a set of AutoGen definitions
Autotrace
Autotrace is a program which converts bitmap images to vector images. It can import images in BMP, TGA, PNM, PPM, PGM, PBM and those supported by ImageMagick, and can output Postscript, svg, xfig, swf, pstoedit, emf, dxf, cgm, mif, p2e and sk
Avaneya: Viking Lander Remastered DVD
Whether you are a fan of science fiction, a space–science enthusiast, hobbyist, photographer, gamer or a patron of grass–roots libre arts and technology, you are sure to find the first successful images from the surface of Mars highly captivating. These mind blowing images were taken by NASA's Viking landers during the highly ambitious, billion–dollar mission first launched in 1975. However, many images were nearly lost to history due to magnetic tape deterioration and archaic proprietary technology. With NASA's blessing, our team developed the technology to recover many of these images. This research tool was part of the design phase of our parent project, Avaneya — our upcoming libre cerebral science fiction game for the GNU operating system set on Mars, described in the words of Richard Stallman as an exciting, pioneering project. Originally an internal research tool, overwhelming public interest compelled us to release the technology on this DVD for all. Now everyone can relive the original breathtaking experience that captured the world's attention and marked the first successful moment in history that humanity saw Mars — not as a distant, impersonal, celestial body, beheld through a telescope for centuries, but as a tangible and alien world well within its reach.
Avl Heckert gnu.tiny.png
libavl is a balanced tree library that comes with full documentation. It includes unthreaded, right threaded, and fully threaded variants of AVL tree, as well as unthreaded red-black trees. It features self-test routines as well as insertion, deletion, tree count, tree copy, tree walking and traversal, search, and threading and unthreading routines. Each function has a comment describing its interface, and each step in the algoritms the program uses has a comment also. Each source code file includes a built-in test routine.
B-Forms
'B-Forms' is an object-oriented PHP library for developing Webform-based applications. It supports tabular forms with multiple records of the same type being edited simultaneously, and provides security mechanism against data tampering. The library provides two base layouts that cover the the vast majority of cases. Only in very tricky form layouts would you have to write HTML code to specify the form layout. It also automatically saves and restores hidden fields. 'B-Forms' divides a script into three logical areas: form definition, data management, and form presentation. Forms have a powerful block architecture, each block typically representing a different data object within the form. Each block can be used to edit several objects at once- the library handles record management.
BLAS
The BLAS (Basic Linear Algebra Subprograms) are routines that provide standard building blocks for performing basic vector and matrix operations. The Level 1 BLAS perform scalar, vector and vector-vector operations, the Level 2 BLAS perform matrix-vector operations, and the Level 3 BLAS perform matrix-matrix operations. Because the BLAS are efficient, portable, and widely available, they are commonly used in the development of high quality linear algebra software, LAPACK for example.
BRL-CAD
BRL-CAD includes an interactive geometry editor, parallel ray-tracing support for rendering and geometric analysis, path-tracing for realistic image synthesis, network distributed framebuffer support, image-processing and signal-processing tools.
Babel
A collection of tools for internationalizing Python applications Babel is composed of two major parts:
  • tools to build and work with gettext message catalogs
  • a Python interface to the CLDR (Common Locale Data Repository), providing access to various locale display names, localized number and date formatting, etc.
Backbone.js
Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface.
Badger
Badger is a library used to generate badge sheets for events, given a PDF template and data for the badges.
Barcode Heckert gnu.tiny.png
GNU barcode is a tool to convert text strings to printed bars. It supports a variety of standard code to represent the strings and creates postscript output. Features include:
  • available as both a library and a command line frontend (so you can include barcode printing in your application)
  • supports UPC, EAN, ISBN, CODE39, and other encoding standards
  • Postscript and encapsulated postscript output (other backends can be added as needed)
  • Accepts sizes and positions as inches, millimeters, and centimeters
  • Can create tables of barcodes (to print labels on sticker pages)
Bcfg2
Bcfg2 allows you to describe and deploy complex configurations across pools of GNU/Linux and Unix systems, leading to a consistent, reproducible, and verifiable description of your environment. Bcfg2's visualization and reporting tools aid in your day-to-day administrative tasks. Its unique analysis features help you cope with the ever-increasing complexity of your networks.
Beanstalkc
beanstalkc is a simple beanstalkd client library for Python. beanstalkd is a fast, distributed, in-memory workqueue service.
BeeCrypt
BeeCrypt is a cryptography library that contains highly optimized C and assembler implementations of many well-known algorithms including Blowfish, MD5, SHA-1, Diffie-Hellman, and ElGamal. Unlike some other crypto libraries, BeeCrypt is not designed to solve one specific problem, like file encryption, but to be a general purpose toolkit which can be used in a variety of applications. There are also no patent or royalty issues associated with BeeCrypt.
Bennu
Bennu is a software library written in PHP that implements the functionality of the IETF iCalendar 2.0 specification (RFC 2445). Its purpose is to enable applications which have an interest in this format (e.g. calendaring, scheduler and organizer programs) to support iCalendar in an easy, powerful, and extensible way.
BigMath
Based partly on Knuth's Seminumerical Algorithms and written in C, BigMath aims to be light-weight and fast. Its original implementation was for use within a kernel extension - thus size and speed were essential. BigMath supports only integer math, including add, sub, mul, div, mod, modpow, modinv, pow, gcd, factorial, radix conversion, scientific notation and various comparisons.
Bill's OpenGL Library
BOGL - an OpenGL scenegraph/renderer supporting modern hardware (vertex and pixel programs via Cg, buffer objects, etc), freetype fonts, XML resource files, bezier patches, state sorting, separate render and simulation threads.
Binary I O library
'libbinio' uses its own protocol to store and retrieve binary data portably. It uses an fprintf/fscanf interface, exporting eight functions: fputf, vfputf, fgetf, vfgetf, fwputf, vfwputf, fwgetf, and vfwgetf. Rather than using data types such as "16 bits", it uses standard C types and uses printf/scanf-style argument lists (it even uses GNU argument checking if available). It should be a drop-in replacement for printf/scanf and still work perfectly well. It aims to be portable to every C89-conforming implementation, but can use C99 and GNU extensions if available.
Bioinformatics Template Library
This library focuses on the data structures and algorithms used in bioinformatics and molecular modelling, following closely the approach of the Standard Template Library (STL) to implement efficient generic programming modules using compile time mechanisms. Although the BTL was designed with biomolecular applications in mind it contains classes of more general utility: for instance, the Matrix class could be used for matrix algebra in many contexts.
BirdFont
BirdFont is a font editor which can generate fonts in SVG, EOT and TTF format.
Biskit
Biskit is a python library for structural bioinformatics research. It simplifies the analysis of macromolecular structures, protein complexes, and molecular dynamics trajectories and offers a platform for the rapid integration of external programs.
Bit Vector
Bit::Vector is a (stand-alone) C library and an object-oriented Perl module (with overloaded operators) which allows you to handle bit vectors, sets (of integers), "big integer arithmetic" (e.g. for cryptography), and boolean matrices (all of arbitrary size) very efficiently. The package also includes an object-oriented Perl module for accessing the C library from Perl (the library can also be used by itself, without Perl). Optionally, it features overloaded operators for maximum ease of use.
BitPacket
BitPacket is a Python module to represent bit field structures in an easy object-oriented way. BitPacket provides three classes: BitField, BitStructure and BitVariableStructure which represent simple bit fields, and fixed and variable structures of bit fields respectively. BitStructure and BitVariableStructure are BitField themselves and all of them can be used together in order to build packets. That is, we can add any BitField subclass into a BitStructure or BitVariableStructure.
Bitap
The bitap library is a clean implementation of regular expression (regex/grep) string matching using the bitap algorithm. Approximate (a.k.a. fuzzy) matching is allowed. This is the same algorithm as the one used in Glimpse and agrep, but it is much more complete with regard to regular expression syntax, and is much cleaner. It is quite fast compared to other greps due to the bitap algoritm and modern CPU architechture. Modifying code for special cases speeds things up even futher. Note that the complete 'search' string must be matched by the pattern. If you want to search for substrings of the search string, prefix and postfix the pattern with '.*'.
Bitstring
bitstring is a pure Python module designed to help make the creation and analysis of binary data as simple and natural as possible. BitStrings can be constructed from integers (big and little endian), hex, octal, binary, strings or files. They can be sliced, joined, reversed, inserted into, overwritten, etc. with simple functions or slice notation. They can also be read from, searched and replaced, and navigated in, similar to a file or stream.
Bitwise enums
A very simple, 0-overhead, and yet type-safe 1-file library for doing bitwise operations between masks represented by enums. Please note: This library has been subsumed into MiLi and is no longer being maintained individually.


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