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Jitsi (previously SIP Communicator) is a cross-platform VOIP, videoconference, desktop sharing and chat client. Protocols supported include SIP, XMPP/Google Talk/Jabber/Facebook chat, AIM/ICQ, Windows Live, Yahoo! Messenger and Bonjour. Other features include: Call recording, Call & chat ... [More] encryption, Noise suppression, Echo cancellation, File transfer, multi-user chat, Desktop streaming, Presence, Conference calls, Integration with Microsoft Outlook and Apple Address Book, Support for LDAP directories, Support for Google Contacts, On-line provisioning, Systray notifications, IPv6 support, Spell checker and many more. [Less]

Linphone is an open source Voice Over IP phone (or SIP phone) that makes possible to communicate freely with people over the internet, with voice, video, and text instant messaging.

QuteCom is the new name for the open source softphone previously known as WengoPhone, a standards-based softphone and multi-protocol IM client. It is a community project focussed on communication over IP, including VoIP, instant messaging and video phonecalls.