We are developing a web application and are looking for a reliable existing infrastructure / application in which there are user management, group management, login screens, group admin screens, User SignUp, etc. I have the feeling that all SaaS providers require such a thing, and there must be something existing, and I no longer need to write everything. I searched google but couldn't find anything like it, but I am sure there is something like this, since this is such a basic requirement for any web application. It can either be in the form of a separate server, or it can be integrated into our application, the language is not important for us. Easy integration and setup are important
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