- sidekiq 6,491 Simple, efficient background processing for Ruby
- inspeqtor 1,370 Monitor your application infrastructure!
- connection_pool 787 Generic connection pooling for Ruby
- girl_friday 589 Have a task you want to get done but don't want to do it yourself? Give it to girl_friday!
- rack-fiber_pool 246 Rack middleware to execute each request in a Fiber