Freeside is an open-source billing and trouble
ticketing package for ISPs, VoIP, hosting,
service, and content providers, and other online
Pbooks is a PHP-based accounting and bookkeeping
system. It is designed for use by small business,
and uses the double-entry accounting model.
A smart CD/DVD/ISO backup solution written in PHP.
Bidirectional RPC support over a simple message interface, e.g. WebSocket.