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A game engine written in GNU Guile Scheme

Sly is a free software game engine written in GNU Guile Scheme. It provides an abstraction layer above SDL and OpenGL for common game programming requirements such as meshes, shaders, sprites, animation, tilesets, scene graph, keyboard/mouse input, and scripting.

Sly differentiates itself from other game engines by providing an interactive development environment via Guile's read-eval-print-loop (REPL), exposing a functional API instead of an object-oriented one, and encouraging reactive programming.


Clones of the source code:

Related Projects



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27 September 2013

Leaders and contributors

David Thompson Maintainer

Resources and communication

AudienceResource typeURI
Python (Ref)
Ruby (Ref)

Software prerequisites

Required to buildGNU Guile >= 2.0.11
Required to buildguile-opengl
Required to buildguile-sdl >= 0.5.0
Required to buildSDL 1.2
Required to buildFreeImage >= 3.0

This entry (in part or in whole) was last reviewed on 29 March 2018.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.