Claris FileMaker is a great tool for no-code rapid application development. It allows you to quickly build bespoke databases/'custom apps' for web, iOS and native Mac/Windows desktops. For maximum speed RAD it has its own built-in database engine, but can also be used as a front end to 3rd party SQL database backends such as MySQL, MS SQL and Oracle.
The platform scales well for small & medium enterprises - i.e. workgroups from 10 - to a few hundred users.
It has been a work horse tool for me as consultant/developer for over 18 years now.