Usermin is a web-based interface for webmail, password changing, mail filters, fetchmail and much more.
Wacko Wiki is a light and handy Wiki-engine.
Lychee is a free photo-management tool, which runs on your server or web-space. Upload, manage and share photos like from a native application.
ZNC is an Internet Relay Chat (IRC) network bouncer or BNC.
Support for UPnP/NAT-PMP, Bittorrent protocol encryption (Azureus-compatible), Peer Exchange compatible with µTorrent, IP filtering, Torrents prioritizing.