Vagrant is a tool for building and distributing development environments.

Classy web-development dressed in a DSL (official / canonical repo)

Acceptance test framework for web applications

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

Chef Infra, a powerful automation platform that transforms infrastructure into code automating how infrastructure is configured, deployed and managed across any environment, at any scale

Sequel: The Database Toolkit for Ruby

EventMachine: fast, simple event-processing library for Ruby programs

Padrino is a full-stack ruby framework built upon Sinatra.

Her is an ORM (Object Relational Mapper) that maps REST resources to Ruby objects. It is designed to build applications that are powered by a RESTful API instead of a database.

Einhorn: the language-independent shared socket manager

Tabbed interface and custom field type for globalize translations for Rails_admin

Integrate sprockets with padrion