FastCST (Fast Change Set Tool) is an experiment in creating a secure revision control system that uses digital signatures and other cryptographic means to verify the identity of submitters. It attempts to strike a balance between security, collaboration, and control, such that everyone can participate safely, no one individual or organization can control others, and collaborators are free to share as they need. It is simple, well tested, and well documented.
Berkeley DB XML is a native XML database engine for use within your product. Made available as a C++ library with language bindings for Java, Perl, Python, PHP, and Tcl, it integrates directly into your application (it is not a standalone database server). It provides XQuery access into a database of document containers. XML documents are stored and indexed in their native format using Berkeley DB as the transactional database engine.
GeoToad is a geocaching query tool to help speed up the boring part of geocaching: choosing the cache and collecting the data. It allows you to generate any kind of complex query you want, and the program will go and poll the Geocaching query, grab the data, and output it to any format you want. The Geocache info can be synced straight to your GPS, iPod, PDA, or cell phone in over 20 different formats.
chessdgm.rb converts a standard chess postion file (in the "fen" format) into a word processor diagram. This is a rewrite in Ruby of a C program (chessdgm), with support for more fonts. The fonts have been included in the tarball with their documentation, and are free for non-commercial use, but not GPL.
Kazehakase is a Web browser which aims to provide a user interface that is truly user-friendly and fully customizable. It supports tabbed browsing, a "remote bookmark" feature (through RSS) in a menu or sidebar, a variable UI to adapt to the user's skill level, and customizable mouse gestures and key accelerators.