by VaxSoft Inc VaxVoIP SIP SDK provides tools and components to quickly add SIP (Session Initiation Protocol) based IP-Telephony make and receive phone calls feature in your web pages and software applications. You can easily develope net-to-phone apps & web pages.
by PeerMe, Inc. PeerMe has developed an instant messaging platform which supports Peer to Peer Voice, PC to PC and PC to handheld voice communications, instant messaging, and peer-to-peer file transfer all over public Internet connections.
by Ringo Club Make voice calls from any PC in the world. Free voice connectivity with Internet users. RinGo allows you to make calls from any place in the world from your PC without the use of PSTN (traditional telephony provider) for local and international calls
by One4000 One4000 SoftGlobalPhone, a Phone-in-the-Phone that lets you take advantage of free broadband calling and super low worldwide rates without changing your operator. 9 ways of calling from all of your phones, including PDA, cellulars and your PC.