- Any of the Sinatra-derived frameworks (flask, express, etc. Language isn't a major factor as the API is small). - Neo4j graph db instead of a relational db.

- Any of the Sinatra-derived frameworks (flask, express, etc. Language isn't a major factor as the API is small). - Neo4j graph db instead of a relational db. Simple crud stuff is easy, and you can encode most business logic (if there is a need for anything beyond basic crud) as simple graph operations, avoiding the need for a bunch of other boilerplate that is found in frameworks that leverage ORMs.