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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Olvid
FluffyChat
Signal
Molly (Signal fork)
TeleGuard
Mi Airit
aTalk
NYNJA
uTox
Tox
qTox
Signal
Torchat
Telegram
Antox
Toxic
uToxFluffyChat - Open. Nonprofit. Cute ?
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
qTox - A Qt graphical user interface for Tox.
Molly (Signal fork) - Molly is an independent Signal fork for Android
TeleGuard - TeleGuard is a secure messenger that makes it store that your data or chats are not stored while collaborating or communicating with partners and friends.