BuddyTalk by InnoMedia - - A 4-in-1 Internet voice communication tool for staying in touch with associates while online. Provides downloads of free software.
Callwave - - Internet Answering Machine software uses Busy Call Forwarding to answer and record callers messages while you are on-line.
Internet Call Manager - - An easy and inexpensive way to stay on-line as long as you want and never miss a phone call.
Pagoo - - Answer calls and make long distance phone calls while online.
Paltalk - - Operates with different chat systems such as ICQ and AIM, and enables live video calls. [Windows.
PC-Telephone - - Make free pc-to-pc and cheap pc-to-phone and pc-to-fax calls over the Internet and ISDN/PSTN telephone networks. Use your computer as internet telephone, ISDN phone, answer phone, caller id, fax software and voicemail client.
VocalTec - - Enables voice and multimedia communications over packetized networks, the Internet and intranets.