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.
The continuation of the Alpine email client from University of Washington.
TkCon is an enhanced interactive console for developing in Tcl. It also has the ability to connect to other Tk send-enabled languages, as well as generically to sockets.
High-performance multithreaded web server
AOLserver is a multithreaded, Tcl-enabled, massively-scalable and extensible web server tuned for large scale, dynamic web sites. AOLserver also includes complete database integration and a dynamic page scripting language.
A Tcl script for Eggdrop providing many of the standard features of other scripts, however, with a twist that it is aimed at bot services. This is the exact script used by the bot service #animebots on Quakenet.