FastImage finds the size or type of an image given its uri by fetching as little as needed.

Appraisal integrates with bundler and rake to test your library against different versions of dependencies in repeatable scenarios called "appraisals."

SimpleCov is a code coverage framework for Ruby with a powerful configuration library and automatic merging of coverage across test suites.

Ensure net/https uses OpenSSL::SSL::VERIFY_PEER to verify SSL certificates and provides certificate bundle in case OpenSSL cannot find one

Ruby applications tests profiling tools.

Contains tools to analyze factories usage, integrate with Ruby profilers, profile your examples using ActiveSupport notifications (if any) and statically analyze your code with custom RuboCop cops.

The Mechanize library is used for automating interaction with websites. Mechanize automatically stores and sends cookies, follows redirects, and can follow links and submit forms. Form fields can be populated and submitted. Mechanize also keeps track of the sites that you have visited as a history.

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 across multiple processes.

Memoize method return values

Immutable extensions to objects

Flamegraph support for arbitrary ruby apps

Minimal embedded v8 engine for Ruby

Minimal embedded v8 engine for Ruby

Minimal embedded v8 engine for Ruby

Run all possible enumerable methods in concurrent/parallel threads

This package provides a library implementing patterns that behave like regular expressions.

This package provides a C-optimized method for determining if a string is blank

This package provides a Ruby client that supports all of the GitHub API methods.

Official AWS Ruby gem for Amazon Simple Storage Service (Amazon S3). This gem is part of the AWS SDK for Ruby.

Instantiate one with `redis = MockRedis.new` and treat it like you would a normal Redis object. It supports all the usual Redis operations.

Measure following file dimensions: apng, bmp, cur, gif, ico, j2c, jp2, jpeg, jpx, mng, pam, pbm, pcx, pgm, png, ppm, psd, svg, swf, tiff, webp, xbm, xpm

Measure following file dimensions: apng, bmp, cur, gif, ico, j2c, jp2, jpeg, jpx, mng, pam, pbm, pcx, pgm, png, ppm, psd, svg, swf, tiff, webp, xbm, xpm

This package provides a common interface to multiple JSON libraries, including Oj, Yajl, the JSON gem (with C-extensions), the pure-Ruby JSON gem, NSJSONSerialization, gson.rb, JrJackson, and OkJson.

Integrate SassC-Ruby into Rails.

Ember for Rails 3.1+