- Asterisk
- Complete version of PBX in software runs on Linux and other Unix-based machines. Offers voice in three protocols and can interact with many standard telephone systems.
- Empower Pro Internet Phone
- Enables users to share peer-to-peer telephone communications over the internet.
- eyeBeam: Voice, Video and IM Softphone
- Full-featured VoIP, video and instant messaging software delivers a host of communications options.
- Haxial KDX
- Features multi-user internet telephone connections over the internet.
- RogerWilco
- Designed so gamers could share voice communications during space battles, RogerWilco offers peer-to-peer voice telephony.
- SJ Labs: SJphone
- Delivers high-quality peer-to-peer voice communications.
- Skype
- Presents free peer-to-peer telephone communications as well as low-cost integration to land lines.
- XMeeting Video Conferencing for Mac OS X
- Allows users to share voice and video communications.
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