Send transactional email and sms by api and make sure that they’re delivered. Create, send and monitor easily with Sweego for developers.

experts freemium €10.0 / Monthly (20000 emails)

Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.

experts 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.

experts Open Source

Free chat and collaboration app for teams with unlimited users and message history.

experts freemium $2.49 / Monthly ("Group calls", "10GB per user", "Screen sharing",)

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

experts Open Source