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Linkello - Video calls simplified, no installation required.
Green Messenger - WhatsApp Messenger Web for Chrome. Text/Chat on computer. Notifications, messages, tools.
jTorchat - jTorchat stands for Java Torchat, and is a complete rewrite of the popular p2p IM messenger Torchat
Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Sesame Chat - A Self-Aware, Digital Assistant that Protects Your Messages