OpenSIPS is a mature implementation of a SIP
server/proxy. It is more than a SIP proxy/router,
as it includes application-level functionalities.
OpenSIPS, as a SIP server, can server as the core
component of any SIP-based VoIP solution.
An anonymizing, filter-bypassing, HTTP/FTP proxy in a CGI script.
A cross-browser library for plotting and interactive geometry.