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Open source implementation of the OpenCL specification for Intel GPUs
http://www.freedesktop.org/wiki/Software/Beignet/
2D graphics library with support for multiple output devices
http://www.cairographics.org/
OpenGL ES specification compliant 3D Graphics driver binary and source code
https://01.org/linuxgraphics/
Middleware which allows user-space to communicate with DRM kernel modules (Intel GPUs)
http://www.mesa3d.org/
Open source test suite for OpenGL and OpenCL implementations
http://piglit.freedesktop.org/
Low-level software library for pixel manipulation
http://www.pixman.org/
Sound system for POSIX OSes, acting as a proxy for your sound applications
http://www.freedesktop.org/wiki/Software/PulseAudio/
Spice virtual desktop interaction
http://www.spice-space.org/
A simpler replacement for X, easier to develop and maintain. Includes Weston, a reference implementation of a Wayland compositor.
http://wayland.freedesktop.org/
X protocol C-language Binding (XCB) - replacement for Xlib.
http://xcb.freedesktop.org/
The X.org sample implementation.
http://www.x.org/