💬 Instant Messaging

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

Matrix is an open standard for decentralized persistent communication over IP.

Open Source

Tomba is the leading solution to find and verify professional email addresses. Start using Tomba and connect with the people that matter for your business.

Try for free Open Source freemium $39.0 / Monthly (Enterprise $389.00/mo Searches 25k Verifications 60k Teams 20)

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

WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.

free

Secure messaging, anywhere

Open Source

Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.

Open Source

Vocaroo is a quick and easy way to share voice messages over the interwebs.

A messaging app for teams who see through the Earth!

Mattermost is an open source alternative to Slack.

Open Source

A Mobile Ethereum OS

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

Messaging and SMS app bundled in stock Android.