VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.
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Signal-FOSS
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Tinfoil Chat - Tinfoil Chat - Onion-routed, endpoint secure messaging system
Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Trillian - Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.