| Abbrev | gem |
| Calculates a set of unique abbreviations for a given set of strings. |
| Base64 | gem |
| Support for encoding and decoding binary data using a Base64 representation. |
| Benchmark | lib |
| Provides methods to measure and report the time used to execute code |
| BigDecimal | gem |
| Arbitrary-precision decimal floating-point number library for Ruby. |
| Bundler | lib |
| The best way to manage your application's dependencies |
| CGI | ext |
| Support for the Common Gateway Interface protocol |
| Coverage | ext |
| Provides coverage measurement for Ruby |
| CSV | gem |
| CSV Reading and Writing |
| Date | ext |
| A subclass of Object includes Comparable module for handling dates |
| DEBUG__ | gem |
| Debugging functionality for Ruby |
| Delegator | lib |
| Provides three abilities to delegate method calls to an object |
| DidYouMean | lib |
| The gem that has been saving people from typos since 2014. |
| Digest | ext |
| Provides a framework for message digest libraries |
| DRb | gem |
| Distributed object system for Ruby. |
| English | lib |
| Require 'English.rb' to reference global variables with less cryptic names |
| ERB | ext |
| An easy to use but powerful templating system for Ruby |
| Etc | ext |
| Provides access to information typically stored in UNIX /etc directory |
| Fcntl | ext |
| Loads constants defined in the OS fcntl.h C header file |
| Fiddle | ext |
| A libffi wrapper for Ruby |
| FileUtils | lib |
| Several file utility methods for copying, moving, removing, etc |
| Find | lib |
| This module supports top-down traversal of a set of file paths |
| Forwardable | lib |
| Provides delegation of specified methods to a designated object |
| GetoptLong | gem |
| GetoptLong for Ruby |
| IO | ext |
| Extension for Ruby IO class, .console |
| IO | ext |
| Extension for Ruby IO class, #nonblock & #nonblock= |
| IO | ext |
| Extension for Ruby IO class, #wait_readable & #wait_writable |
| IPAddr | lib |
| Provides methods to manipulate IPv4 and IPv6 IP addresses |
| IRB | lib |
| Interactive Ruby command-line tool for REPL (Read Eval Print Loop) |
| JSON | ext |
| Implements Javascript Object Notation for Ruby |
| Logger | lib |
| Provides a simple logging utility for outputing messages |
| Matrix | gem |
| Represents a mathematical matrix. |
| | gem |
| minitest provides a complete suite of testing facilities supporting TDD, BDD, mocking, and benchmarking. |
| MakeMakefile | lib |
| Module used to generate a Makefile for C extensions |
| Monitor | ext |
| Provides an object or module to use safely by more than one thread |
| Mutex_m | gem |
| Mixin to extend objects to be handled like a Mutex |
| Net::FTP | gem |
| File Transfer Protocol |
| Net::IMAP | gem |
| Internet Message Access Protocol |
| Net::POP3 | gem |
| Post Office Protocol |
| Net::SMTP | gem |
| Simple Mail Transfer Protocol |
| Net::HTTP | lib |
| Hypertext Transfer Protocol |
| Net::Protocol | lib |
| Internal Protocol Class |
| NKF | gem |
| Ruby extension for Network Kanji Filter. |
| ObjectSpace | ext |
| Extends ObjectSpace module to add methods for internal statistics |
| Observable | gem |
| Implementation of the Observer object-oriented design pattern. |
| OpenURI | lib |
| An easy-to-use wrapper for Net::HTTP, Net::HTTPS and Net::FTP |
| Open3 | lib |
| Provides access to stdin, stdout and stderr when running other programs |
| OpenSSL | ext |
| Provides SSL, TSL and general purpose cryptography for Ruby |
| OptionParser | lib |
| Ruby-oriented class for command-line option analysis |
| OpenStruct | lib |
| Class to build custom data structures, similar to a Hash |
| Pathname | ext |
| Representation of the name of a file or directory on the filesystem |
| PowerAssert | gem |
| Power Assert shows each value of variables and method calls in the expression. |
| PP | lib |
| Provides a PrettyPrinter for Ruby objects |
| PrettyPrint | lib |
| Implements a pretty printing algorithm for readable structure |
| Prime | gem |
| Prime numbers and factorization library. |
| Prism | lib |
| Prism Ruby parser |
| PStore | lib |
| Implements a file based persistence mechanism based on a Hash |
| Psych | ext |
| A YAML parser and emitter for Ruby |
| PTY | ext |
| Creates and manages pseudo terminals |
| Racc | gem |
| Racc is a LALR(1) parser generator |
| Racc | gem |
| |
| Rake | gem |
| Rake is a Make-like program implemented in Ruby. |
| RBS | gem |
| Type signature for Ruby |
| RDoc | lib |
| Produces HTML and command-line documentation for Ruby |
| Reline | lib |
| A pure Ruby implementation of Readline / Editline |
| ReplTypeCompletor | gem |
| Type based completion for REPL. |
| Resolv | lib |
| Thread-aware DNS resolver library in Ruby |
| | gem |
| Replace Socket DNS with Resolv. |
| REXML | gem |
| An XML toolkit for Ruby |
| Rinda | gem |
| The Linda distributed computing paradigm in Ruby. |
| Ripper | ext |
| Provides an interface for parsing Ruby programs into S-expressions |
| RSS | gem |
| Family of libraries that support various formats of XML feeds |
| Gem | lib |
| Package management framework for Ruby |
| SecureRandom | lib |
| Interface for secure random number generator |
| Set | lib |
| Provides a class to deal with collections of unordered, unique values |
| Shellwords | lib |
| Manipulates strings with word parsing rules of UNIX Bourne shell |
| Singleton | lib |
| Implementation of the Singleton pattern for Ruby |
| Socket | ext |
| Access underlying OS socket implementations |
| StringIO | ext |
| Pseudo I/O on String objects |
| StringScanner | ext |
| Provides lexical scanning operations on a String |
| SyntaxSuggest | lib |
| Find syntax errors in your source in a snap |
| Syslog | gem |
| Ruby interface for the POSIX system logging facility. |
| Tempfile | lib |
| A utility class for managing temporary files |
| Test::Unit | gem |
| test-unit (Test::Unit) is unit testing framework for Ruby, based on xUnit principles. It allows writing tests, checking results and automated testing in Ruby. |
| Time | lib |
| Extends the Time class with methods for parsing and conversion |
| Timeout | lib |
| Auto-terminate potentially long-running operations in Ruby |
| Dir | lib |
| Extends the Dir class to manage the OS temporary file path |
| TSort | lib |
| Topological sorting using Tarjan's algorithm |
| TypeProf | gem |
| An experimental type-level Ruby interpreter for testing and understanding Ruby code. |
| | lib |
| Utilities to replace common UNIX commands |
| UnicodeNormalize | lib |
| Provides three String 'unicode_normalize' methods |
| URI | lib |
| A Ruby module providing support for Uniform Resource Identifiers |
| WeakRef | lib |
| Allows a referenced object to be garbage-collected |
| | ext |
| Win32 Registry, SSPI (Security Support Provider Interface) |
| WIN32OLE | ext |
| Provides an interface for OLE Automation in Ruby |
| YAML | lib |
| Ruby client library for the Psych YAML implementation |
| YAML::DBM | lib |
| YAML::DBM is a ::DBM type interface which allows YAML for values |
| YAML::Store | lib |
| Store provides the same functionality as PStore, except it uses YAML to dump objects instead of Marshal. |
| Zlib | ext |
| Ruby interface for the zlib compression/decompression library |