- plataformatec/devise 15,771 Flexible authentication solution for Rails with Warden.
- carrierwaveuploader/carrierwave 6,936 Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks
- amatsuda/kaminari 5,954 A Scope & Engine based, clean, powerful, customizable and sophisticated paginator for Rails 3 and 4
- stympy/faker 4,188 A library for generating fake data such as names, addresses, and phone numbers.
- alexreisner/geocoder 4,113 Complete Ruby geocoding solution.