Capybara is an integration testing tool for rack based web applications. It simulates how a user would interact with a website

Sprockets Rails integration

Crass is a pure Ruby CSS parser based on the CSS Syntax Level 3 spec.

Ruby CoffeeScript is a bridge to the JS CoffeeScript compiler.

This is a wrapper library to bring Unicode Normalization Form support to Ruby/JRuby.

CocoaPods manages library dependencies for your Xcode project. You specify the dependencies for your project in one easy text file. CocoaPods resolves dependencies between libraries, fetches source code for the dependencies, and creates and maintains an Xcode workspace to build your project. Ultimately, the goal is to improve discoverability of, and engagement in, third party open-source libraries, by creating a more centralized ecosystem.

FSEvents API with Signals catching (without RubyCocoa)

We use this library at GitHub to detect blob languages, highlight code, ignore binary files, suppress generated files in diffs, and generate language breakdown graphs.

GitLab Language detection

Kaminari is a Scope & Engine based, clean, powerful, agnostic, customizable and sophisticated paginator for Rails 4+

ExecJS lets you run JavaScript code from Ruby.

Simple mime type detection using magic numbers, filenames, and extensions

The OS gem allows for some useful and easy functions, like OS.windows? (=> true or false) OS.bits ( => 32 or 64) etc"

Arel Really Exasperates Logicians Arel is a SQL AST manager for Ruby. It 1. Simplifies the generation of complex SQL queries 2. Adapts to various RDBMSes It is intended to be a framework framework; that is, you can build your own ORM with it, focusing on innovative object and collection modeling as opposed to database compatibility and query generation.

Net::SSH: a pure-Ruby implementation of the SSH2 client protocol. It allows you to write programs that invoke and interact with processes on remote servers, via SSH2.

kaminari-core includes pagination logic independent from ORMs and view libraries

kaminari-activerecord lets your Active Record models be paginatable

kaminari-actionview provides pagination helpers for your Action View templates

Wrap an option at compile-time and `call` it at runtime, which allows to have the common `-> ()`, `:method` or `Callable` pattern used for most options.

Simple, feature rich ascii table generation library