When I started erlang, I had a hard time thinking of ideas for projects to improve my skills. Now I have way too many ideas to possibly implement Myself. Since I actually want these projects to exist so I can use them (everlasting glory coming secondary to some handy tools) I have written them up here. Feel free to try them out. I'm open to questions and suggestions.
swagger is a JSON spec for REST APIs. Once you have written a spec in swagger, it can generate documentation (demo) and REST handlers.
An erlang swagger library should take swagger specs and generate cowboy_rest handlers for them.
Difficulty: low