heartcombo / devise

Flexible authentication solution for Rails with Warden.

omniauth / omniauth

OmniAuth is a flexible authentication system utilizing Rack middleware.

hanami / hanami

A flexible framework for maintainable Ruby apps

lostisland / faraday

Simple, but flexible HTTP client library, with support for multiple backends.

dry-rb / dry-types

Flexible type system for Ruby with coercions and constraints

Shopify / liquid

Liquid markup language. Safe, customer facing template language for flexible web apps.