And if you want something open source which you can install on your own machines, Odoo[1] is a nice alternative (disclaimer: I work for a partner company). It works in a similar way; you just define the model with its fields (as a Python class), add a view where you just indicate which fields to expose and where, and then a menu entry to point to that model, and done! You can even skip the view if you don't mind it generating a basic one for you.

[1] https://www.odoo.com/