A versatile, Javascript driven DHTML menu that works on most popular browsers. It comes in 3 basic modes: vertical, horizontal or collapsing and folds/unfolds on clicks or mouseovers. [Open source, LGPL]
The LessTif/Motif Extension library, is a set of widgets that make programming with the Motif API easier as it adds a set of frequently used tools, mostly authored by Rick Scott.
XL is designed to implement the ideas of Concept Programming. It can apply to many domains and problem spaces, not only a small subset of the problems users must solve.
A framework for building data management procedures using XML-based configuration files. XFP is also a server that provides scheduled execution of procedures, email notifications and a configurable logging system. [Open source, Apache Software License]
Add-on able to log the packs of file server bots, and which also has the capability to send and receive e-mail. Also offers the IRC Klipper XDCC search engine along with its source code.