I'm working on Internal Developer Platform for private clouds. Kind of like private Heroku. It works standalone and installed fully automatic. With primary focus on Low Operations and Self-service where app developers can focus on delivering real business value instead of boilerplate tasks or waiting for other teams to plan and execute standard tasks.
We originally started supporting Low-code solution called Mendix. Now we support any type of web app that can be packaged as an OCI image.
You can read or try it at: https://low-ops.com