Manyverse - A social network off the grid
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Public - Group chats.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Wire - Private & Secure Messenger
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.