A frontend written in sh which makes Portage (the Gentoo Linux package manager) more efficient by backgrounding downloads and allowing for automatic prelinking of packages.
A troubleshooting assistant for Mac OS X which runs even if you can't load the GUI, or don't have a startup CD handy. AppleJack runs in Single User Mode and is menu-based for ease of use.
A compact web framework providing session management, its own server, and templating using Cheetah; code, documentation, and a tutorial are available. [Open Source, BSD-like]
A server side object inspector for web applications. Through a web interface drill down in server side java beans. There are spectial support for Jakarta Struts objects. Online demo. [Open source, zlib/libpng License]