qTox is a chat, voice, video, and file transfer IM client using the encrypted peer-to-peer Tox protocol.
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qTox is a chat, voice, video, and file transfer IM client using the encrypted peer-to-peer Tox protocol.
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Ekiga is a VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols.
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Kamailio is an open source implementation of a SIP Signaling Server.
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Wire is a cross-platform, encrypted instant messaging client. It allows users to exchange text, voice, photo, video and music messages.
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Asterisk is a Private Branch eXchange and telephony toolkit. It is a hybrid TDM and packet voice PBX and IVR platform with ACD functionality.
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FreeSWITCH is a telephony platform to facilitate the creation of voice and chat driven products from a soft-phone up to a soft-switch.
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Linphone is a web phone, Make two-party calls over IP networks such as the Internet, freely, with voice, video, and text instant messaging.
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GNU Gatekeeper (GnuGk) is a feature-rich project that implements an H.323 gatekeeper.
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GNU Ring (formerly SFLphone) is an open source SIP-compatible softphone and SIP-based instant messenger for Linux.
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Mumble is a voice chat application for groups. While it can be used for any kind of activity, it is primarily intended for gaming.
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