OpenSolaris is the open source operating system created when Sun released most of the source code to the Solaris OS.

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics.

A variety of device drivers allows Mesa to be used in many different environments ranging from software emulation to complete hardware acceleration for modern GPUs.

Mesa ties into several other open-source projects: the Direct Rendering Infrastructure and X.org to provide OpenGL support to users of X on Linux, FreeBSD and other operating systems.

The X.Org project provides an open source implementation of the X Window System, which is the primary framework used for displaying graphical user interfaces such as GNOME & KDE on Linux and Unix systems.