Freeware Internet Voice chat

• OpenH323 Project



• Speak Freely [GNU GPL]



• Ekiga.org [GNU GPL]



• AsteriskWin32 [GNU GPL]



• IAX Phone [GNU GPL]

SIP VoIP:

• PhoneGaim [GNU GPL]



• Shtoom [GNU LGPL]



• SIP COMMUNICATOR [Apache Software License]



• sipXphone [GNU LGPL]



• sipXezPhone [GNU LGPL]



• SIPp [GNU GPL]



• wengo [GNU GPL]