WordPress is an open source content management solution based on PHP maintained by Automattic which is also being offered as hosted solution.

Ampache is a free software Web-based Audio file manager / web Media Server.

Wooclap is a collaborative platform for your conferences and your training sessions.

Piwik is the leading open alternative to Google Analytics that gives you full control over your data.

Baïkal is a Cal and CardDAV server, based on sabre/dav, that includes an administrative interface for easy management.

Mongoose is an embedded web server.