A toolkit for building modeling frameworks like Active Record. Rich support for attributes, callbacks, validations, serialization, internationalization, and testing.

Email on Rails. Compose, deliver, and test emails using the familiar controller/view pattern. First-class support for multipart email and attachments.

Attach cloud and local files in Rails applications.

minitest provides a complete suite of testing facilities supporting TDD, BDD, and benchmarking. "I had a class with Jim Weirich on testing last week and we were allowed to choose our testing frameworks. Kirk Haines and I were paired up and we cracked open the code for a few test ...

Diff::LCS computes the difference between two Enumerable sequences using the McIlroy-Hunt longest common subsequence (LCS) algorithm. It includes utilities to create a simple HTML diff output format and a standard diff-like tool. This is release 2.0, which has significant breaking changes (remov...

A package (also known as a library) contains a set of functionality that can be invoked by a Ruby program, such as reading and parsing an XML file. We call these packages 'gems' and RubyGems is a tool to install, create, manage and load these packages in your Ruby environment. RubyGems is a...

Protect against typical web attacks, works with all Rack apps, including Rails

CoffeeScript is a little language that compiles into JavaScript. Underneath all of those embarrassing braces and semicolons, JavaScript has always had a gorgeous object model at its heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way.

Pry is a runtime developer console and IRB alternative with powerful introspection capabilities. Pry aims to be more than an IRB replacement. It is an attempt to bring REPL driven programming to the Ruby language.

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.

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.

Docile treats the methods of a given ruby object as a DSL (domain specific language) within a given block. Killer feature: you can also reference methods, instance variables, and local variables from the original (non-DSL) context within the block. Docile releases follow Semantic Versioning a...

This gem aims at being a simple and reliable solution for controlling external programs running in the background on any Ruby / OS combination.

Track changes to your models, for auditing or versioning. See how a model looked at any stage in its lifecycle, revert it to any version, or restore it after it has been destroyed.

Convert directories, rpms, python eggs, rubygems, and more to rpms, debs, solaris packages and more. Win at package management without wasting pointless hours debugging bad rpm specs!

Official AWS Ruby gem for Amazon Athena. This gem is part of the AWS SDK for Ruby.

This pure Ruby library can read and write PNG images without depending on an external image library, like RMagick. It tries to be memory efficient and reasonably fast. It supports reading and writing all PNG variants that are defined in the specification, with one limitation: onl...

raindrops is a real-time stats toolkit to show statistics for Rack HTTP servers. It is designed for preforking servers such as unicorn, but should support any Rack HTTP server on platforms supporting POSIX shared memory. It may also be used as a generic scoreboard for sharing atomic counters ac...

A rack middleware for throttling and blocking abusive requests

A simple gem to atomically write files