Lync enables users to communicate securely anywhere they have network connectivity, and automatically adapts to network conditions.
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Mac OS X
Windows
Android
iPhone
Web
Lync enables users to communicate securely anywhere they have network connectivity, and automatically adapts to network conditions. The unified communications platform integrated into Microsoft Office includes IM, Audio, Video, Web and Conferencing.
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full end-to-end encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP...
Wire is a secure and private messenger for phones, tablets and desktop. Crystal clear voice and video calls, private group chats, file sharing, audio and video messages - everything is end-to-end encrypted.
FreeOpen SourceMac OS XWindowsLinuxAndroidiPhoneAndroid TabletiPadWeb
Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols.
VIPole is a Secure Instant Messenger for secure messaging, encrypted voice/video calls, group chats that provides highly secure and strongly encrypted environment for all your communications and files you exchange over internet.
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