Another worthy mention (not FE, but also exploiting power of sql): https://github.com/PostgREST/postgrest

"PostgREST serves a fully RESTful API from any existing PostgreSQL database. It provides a cleaner, more standards-compliant, faster API than you are likely to write from scratch."

PostgREST is really hard to figure out how to use though. I tried it a year or two ago because I was really excited about the posibillity, but the setup was super unintuitive, and the docs were hard to follow. I got a simple case working, but in the end I gave up on using it for anything serious - I simply wouldn't trust myself to be able to debug it if something went wrong.