Backup adds instant version control to any file on a Unix system. It is a lightweight interface to the Subversion svn_fs library. It uses the powerful version control software as a backend to a simple and minimalistic (though effective) user interface. It is designed for use on Linux/Unix systems as a method of archiving configuration files that change semi-frequently, but do not necessarily warrant their own version control mechanism or repository.
MediaWiki ScreenPlay Extension is a text formatting add-on which allows screenwriters and hobbyists to use a MediaWiki server as a screenwriting tool. Using normal wiki syntax, you can easily write a page that will be rendered in proper screenplay format. You can export your work as a PDF for distribution or printing hard copies.
phpMyID is a small, fairly lightweight, standalone, single-user Identity Provider for OpenID authentication. It comprises a single PHP script that can be used by one individual to run their own personal OpenID "IdP." The program requires no external libraries, and has very minimal requirements. It should run on almost any server that runs PHP 4 or 5. It requires no database, and does not access the file system beyond session handling.
tngCalendar is a Web calendar addon to the TNG software for online genealogy. It adds a convenient view of your family history, overlaying anniversaries of births, deaths, and marriages on top of an easy-to-understand calendar. It can be dropped in-place over a commercial TNG installation, or installed in a parallel directory.