Billion Softswitch
Billion Softswitch VoIP SIP/H323 proxy server for Windows, Linux, FreeBSD
VaxVoIP SIP Server SDK
vaxvoip server sdk provide tools and components to develop sip based voip server
Express Talk Business VoIP for Pocket PC
Internet phone to make calls on your Pocket PC
Express Talk Business VoIP for Mac
Internet phone to make calls on your Mac OS X
AV Voice Changer Software
change your voice over ip and pc to phone in real time with "quick" nickvoices.