Java wrapper for the popular chat & VOIP service
ICTCore: Unified Communications Framework for web developers
A beautiful SMS messenger for Android
Java VoIP Softphone (SIP) (replaced by jfPhone)
High performance, production quality STUN server and client library
Blocks unwanted calls using caller ID and a modem
H.323 Gatekeeper for VoIP and videconferencing
CMS API Server with web site
Positional Audio Communication for Minecraft with Mumble
OpenSource Call Center and Dialer System