UnityWiki is a Wiki implemented as a simple Python script. It supports a wide range of formatting (lists, tables, comments) and handles conflicting edits sensibly. It is derived from PikiPiki, and was originally intended for small-group collaboration.
nflash is a perl/cgiscript providing a easy to use and maintain way of posting news to a website. It is possible to create users being able to edit their own preferences and postings. There is a webinterface, comments, multilinguality, encryption.
A free replacement (in Python) for Radio Community Server and a miniature application server, with an embedded almost-OO database and a very quick script handler.
TINABlog is a web logging script written in PHP4. It is intended to be a lightweight script, providing just the necessary functions for maintaining a log or diary on a website.
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The Web Teacher Evaluations are comprised of a Perl CGIscript that allows students to grade/comment on teachers, plus a Perl HTML file containing most of the web pages. Only uses a flat-file DB at present, but interfacing with mySQL or postgreSQL is easy