https://github.com/appsmithorg/appsmith/ is an open source… admin builder? I think that’s probably the best terms I can come up with to describe it. You connect it to databases or APIs and use drag-and-drop UI components primarily to build administrative tools.
I’ve found that “admin” is one part of building a product that a lot of folks often forget to think about when they’re planning. It’s often all about what users need to do. But it’s also important that the people running the platform can manage the data or interact with it for support purposes, etc. Appsmith makes it easy to build those types of workflows. Similar to Retool, but open source!