Linkello - Video calls simplified, no installation required.
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
jTorchat - jTorchat stands for Java Torchat, and is a complete rewrite of the popular p2p IM messenger Torchat
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
uTox - µTox is the lightweight client with minimal dependencies; it not only looks pretty, it runs...
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.