Ruby

Benchmark:: Provides methods to measure and report the time used to execute code

CGI:: Support for the Common Gateway Interface protocol

CMath:: Provides Trigonometric and Transcendental functions for complex numbers

ConditionVariable:: Augments the Mutex class, provided by thread.rb

CSV:: Provides an interface to read and write CSV files and data

DEBUGGER__:: Debugging functionality for Ruby

Find:: This module supports top-down traversal of a set of file paths

Forwardable:: Provides delegation of specified methods to a designated object

GetoptLong:: Parse command line options similar to the GNU C getopt_long()

IPAddr:: Provides methods to manipulate IPv4 and IPv6 IP addresses

IRB:: Interactive Ruby command-line tool for REPL (Read Eval Print Loop)

Logger:: Provides a simple logging utility for outputing messages

mathn.rb:: Deprecated library that extends math operations

MakeMakefile:: Module used to generate a Makefile for C extensions

Matrix:: Represents a mathematical matrix.

Monitor:: Provides an object or module to use safely by more than one thread

Mutex_m:: Mixin to extend objects to be handled like a Mutex

Net::FTP:: Support for the File Transfer Protocol

Queue:: Synchronized communication between threads, provided by thread.rb

Racc:: A LALR(1) parser generator written in Ruby.

Rake:: Ruby build program with capabilities similar to make

RbConfig:: Information of your configure and build of Ruby

RDoc:: Produces HTML and command-line documentation for Ruby

resolv-replace.rb:: Replace Socket DNS with Resolv

Singleton:: Implementation of the Singleton pattern for Ruby

Synchronizer:: A module that provides a two-phase lock with a counter

Tempfile:: A utility class for managing temporary files

Thread:: Provides support classes for threaded programs

ThreadsWait:: Watches for termination of multiple threads

Time:: Extends the Time class with methods for parsing and conversion