PgSearch builds Active Record named scopes that take advantage of PostgreSQL's full text search

Quality is a tool that runs quality checks on your code using community tools, and makes sure your numbers don't get any worse over time. Just add 'rake quality' as part of your Continuous Integration

ActiveModel Serializers addon for eliminating N+1 queries problem from the serializers.

Pronto runner for Undercover - actionable code coverage

Finds largest source files in a project

A framework for creating CRUDs in Rails APIs

Undercover checkstyle reporter.