https://ant0ine.github.io/go-json-rest/
Gorilla is useful, but more for its range of standalone components than as a framework.
https://github.com/gorilla
Then you'll want database-related packages like redigo and gorp.
https://github.com/garyburd/redigo
https://github.com/go-gorp/gorp
https://github.com/emicklei/go-restful