Viewglob is a filesystem visualization add-on for Bash and Zsh. It tracks the command line and environment of any number of interactive shells (local and remote). A graphical display follows the currently active terminal, listing the contents of directories relevant to its shell and highlighting file selections and potential name completions dynamically.
Web Gedcom Viewer is a full Web-based Gedcom viewer that uses MySQL or SQLite on the backend and Perl as the frontend with templates for easy HTML manipulation. Gedcom files are in the standard format exported by family tree/genealogy applications such as Family Tree Maker or Personal Ancestory File. Plugging in different SQL types is a breeze, as all of the SQL statements are centralized to a single pm.
BIE (Business Integration Engine) is an open source integration system that makes it easy for organizations to exchange data with external trading partners regardless of their native applications. It competes in the same space as applications like Microsoft BizTalk except that it is truly cross-platform since it written in Java.
Ruby appscript (rb-appscript) is a high-level, user-friendly Apple event bridge that allows you to control scriptable MacOS X applications using ordinary Ruby scripts. It is a port of the powerful, mature Python appscript package, making Ruby a serious alternative to Apple's own AppleScript language for automating your Mac.
PostNuke is a Weblog/portal system featuring an extremely easy-to-use Web-based installation script. It is extremely developer and community friendly, with active development progressing, support forums around the world, and live support via its own IRC network. It was originally based on PHP-Nuke, but was rewritten with security and performance in mind.
txt2pdf PRO is a very flexible and powerfu program that converts files from text to PDF format. It extends txt2pdf with features such as the ability to add form feeds, to skip the first form feed, to set the top and left margins, to use images (JPEGs) in the background, and to create compressed PDFs.