Pligg CMS

Pligg CMS: "In a world with so many Content Management Systems fighting for control it can seem nearly impossible to pick out a perfect CMS to suit your needs. "
Pligg is unique compared to most other content management systems because of it's flexibility. A web designer can do pretty much anything with Pligg because the software was designed to be used in as many ways as possible. Not only can a person with very little knowledge of PHP and MySQL install it, but they can modify and administer it with relatively little difficulty. For those who have a greater understanding of web languages, Pligg can act as the first step in a highly customized personal content management system.

TCExam (assessment, e-exam, CBT)

TCExam (assessment, e-exam, CBT): "TCExam is an assessment software system that enables educators and trainers to author, schedule, deliver, and report on surveys, quizzes, tests and exams. The software is used all over the world by universities, schools, companies and independent teachers. TCExam is open source and completely free to use.
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[A] m p a c h e : For the love of music since May 5th 2001

[A] m p a c h e : For the love of music since May 5th 2001: "Ampache is a PHP-based tool for managing, updating and playing your MP3/OGG/RM/FLAC/WMA/M4A files via a web interface. It allows you to save playlists, create user accounts, and share your music catalogs with other Ampache servers."