Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
TrueCommerce - EDI Systems and EDI Software From TrueCommerce – The Industry’s Most Accredited Managed Service EDI Provider By ERP Software Publishers.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
iR*EDI - B2B EDI automation software
tSIP - tomeko.net/software: SIP client for Windows.
Jitterbit - Jitterbit is an open source integration software that helps businesses connect applications, data and systems.