Salesforce, firebase or Supabase etc., but, all are SAAS platforms. Not sure if there is any other platform where you can do database and applications that you can host yourself.
Have a look at harbour project on github.
It compiles Clipper code to be run on several different platforms, in text and gui mode (also with Qt bindings) and mow there are several frameworks for web development
Salesforce, firebase or Supabase etc., but, all are SAAS platforms. Not sure if there is any other platform where you can do database and applications that you can host yourself.