Komodo

Komodo is an open-source tool for building and deploying software across many servers. It is intended for people who run their own infrastructure and want a single place to manage builds and deployments on all of their machines, rather than logging in to each one separately.

The project states that there is no limit on the number of servers that can be connected and no restriction on the API available for automation. Servers are connected through a component called Periphery, which has its own setup guide, and the maintainers publish a roadmap, a public demo and a build server for people who want to look around. Screenshots show both light and dark themes.

Komodo is written in Rust and released under GPL-3.0. The maintainers warn that, although they try to keep releases stable, the software comes with no warranty, so it should be used at your own risk. Documentation is available on the project site and community discussion happens on Discord.