I'm an organizer of ginza.rb.  I maintain the following softwares.

• Sorcery/sorcery: Magical Authentication
• gazay/gon: Your Rails variables in your JS
• willnet/seed-do: Advanced seed data handling for Rails, combining the best practices of several methods together.
• willnet/a-nti_manner_kick_course: This library detects code or gems that violate lazy loading conventions during Rails initialization.
• willnet/ci_logger: Logger for CI
• etc.