Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Termix - Modern and easy to use ssh client for macOS and Windows
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Prompt 2 by Panic - The best SSH client for iOS
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
Dataplicity - Dataplicity is a remote terminal for your Pi.