MSpec is a specialized framework that is syntax-compatible with RSpec 2 for basic features. MSpec contains additional features that assist in writing specs for Ruby implementations in ruby/spec.

Inspired by Electric XML library for Java, REXML aims to be easy-to-use API, small and fast. It supports both tree and stream document parsing.

VersionGem aims to provide introspection of a Version module based on a Version::VERSION constant string wile not interfering with gemspec parsing where the VERSION string is traditionally used.

Rerun is a tool to launch programs, then monitor the file system, and restart the program when any of the monitored files change. It's written in Ruby, but can be used for all programs.

This library provides functionality to send Internet mail via SMTP, the Simple Mail Transfer Protocol. The SMTP protocol specification is known as RFC2821.

mkmf-lite is a light version of Ruby's mkmf.rb designed for use as a library. It does not create packages, builds, or log files of any kind. Instead, it provides mixin methods that you can use in FFI or tests to check for the presence of header files, constants, and so on.

This library extends Warden to support OAuth 2.0 authorized API requests.

stackprof is a fast sampling profiler for Ruby code, with cpu, wallclock and object allocation samplers.

Samovar is a modern framework for building command-line tools and applications. It provides a declarative class-based DSL for building command-line parsers that include automatic documentation generation. It helps you keep your functionality clean and isolated where possible.

Net::SFTP is a pure Ruby implementation of the SFTP protocol (specifically, versions 1 through 6 of the SFTP protocol). Note that this is the “Secure File Transfer Protocol”, typically run over an SSH connection, and has nothing to do with the FTP protocol.

Ruby/ProgressBar is an flexible text progress bar library for Ruby. The output can be customized with a formatting system.

pry-stack_explorer is a plugin for the Pry REPL that add support to navigate the call-stack.

When mutex_m is required, any object that extends or includes Mutex_m will be treated like a Mutex.

Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests. This is an older version of VCR that is free software under the Expat license. The project later switched to the Hippocratic license, which is non-free. Do not use it in new free software projects.

This RSpec plugin allows you to use block_is_expected similarly to how you would use is_expected if a block was wrapping the subject.

Pg is the Ruby interface to the PostgreSQL RDBMS. It works with PostgreSQL 9.3 and later.

This package provides a Ruby module that provides a two-phase lock with a counter.

nio provides cross-platform asynchronous I/O primitives in Ruby for scalable network clients and servers.

This package allows you to test FTP implementations in ruby. It is a minimal single-client FTP server that can be bound to any arbitrary port on localhost.

This library makes it easier to discover the truth values of various Ruby objects.

Sass Spec is a test suite for Sass. Test cases are all in the spec directory.

Pleaserun is a tool to generate startup scripts and service definitions. It targets service managers such as systemd, Upstart, launchd, sysv init, and runit.

Warden is a Rack-based middleware that provides a mechanism for authentication in Ruby web applications.

Lemon is a unit testing framework that enforces highly formal case-to-class and unit-to-method test construction. This enforcement can help focus concern on individual units of behavior.