Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
DMD is a flexible DVD-like media container format. Play-DMD is a simple DMD-disk player.
Sakura is a Knowledge Navigator and User Interface for UNIX, which implements HyperMedia and its own windowing and packing system, both in the main program and in an extensive API for Tcl and other languages.
This project, Acme SAC, aims to package a version of Acme written for the Inferno operating system as a stand alone editor for multiple platforms. Currently only for Windows.
MWIP (Mean What I Play) is a clone of PWIM written in Lua. It is faster than the original PWIM (which was in Python), and also contains extra features and better documentation. It is meant to be a complete replacement to PWIM.