Pagoo
Answer calls and make long distance phone calls while online.

VocalTec
Enables voice and multimedia communications over packetized networks, the Internet and intranets.

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.

PalTalk.com
Enables live video calls, conference calls and voice chat-rooms.

Net2Phone
Voice calls from your PC to any phone.

BuddyTalk by InnoMedia
A 4-in-1 Internet voice communication tool for staying in touch with associates while online. Provides downloads of free software.

DialPad.com
Make long-distance phone calls with your PC.

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.