Feng Office (formerly known as OpenGoo) is a free and open source online project management and collaboration tool, licensed under the Affero GPL 3 license.
Simple, web-based address & phone book
Simple, web-based address & phone book, contact manager, organizer. Groups, addresses, e-Mails, phone numbers & birthdays. vCards, LDIF, Excel, iPhone, Gmail & Google-Maps supported. PHP / MySQL based. http://php-addressbook.sourceforge.net/demo
Fully customizable web chat created using AJAX.
Diverse P2P Filesharing
PeerProject is a versatile peer-to-peer filesharing client and file manager. Intuitive and aesthetic while supporting many networks and features. BitTorrent, G2, Gnutella, eDonkey, DC++, IRC, http/ftp & more. Mainstream fork of Shareaza p2p, for Windows & WINE. (See Envy fork for further development.)
Simple, modern & fast web-based email client
Modest system requirements, decent performance, simple installation and upgrade, no database required - all these make RainLoop Webmail a perfect choice for your email solution.
Refined P2P Filesharing + BitTorrent
Envy is a powerful multi-network p2p filesharing and torrent client for Windows or Wine. A mature mainstream fork of Shareaza. Highly skinnable, with BitTorrent/DHT, G2/Gnutella², Gnutella, ED2K/eMule, DC++, http/ftp protocols -and blacklist support baked in. Let others browse your public files.
eyeOS first versions published as Open Source.
eyeOS is a Web Desktop done with PHP and MySQL. Versions until 2.0 are Open Source. For later versions please visit eyeos.org