XMPP

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.

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.

Time (zone) travelling

Full featured and easy to use Jabber client

Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.

Open Source free

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Open Source

Fast, simple & secure messaging. Privacy that fits in your pocket.

Open Source

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.

Open Source

AstraChat is a reliable mobile & desktop cross platform chat and communication solution that allows you to exchange information and data securely in real time.

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.

Open Source

Disa is your new messaging hub.

Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!

Social network reinvented