members features plugin for inspiration

I am going to develop for me some aplication, which would use wordpress users schema (logins, roles …) and then it would have nothing to do with wordpress. I want let visitors to register, give them some default role, and users with this role will have a possibility to add some content (their favourite places – GPS location, title, notes and some other things). Their will be owners of this content, so only they (and admins) will be able to change it, add new place under their account etc. I wander if there is such plugin, which would do simillar things, where i can get inspired. Thanks