Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Pisth - Pisth is an open source SSH and SFTP client for iOS.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Prompt 2 by Panic - The best SSH client for iOS
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Dataplicity - Dataplicity is a remote terminal for your Pi.