RDE: Ruby Development Environment
- Integrated Development Environment, mostly a GUI wrapper of debug.rb with editor, Windows only. Screenshot, description, downloads: old, new.
- http://homepage2.nifty.com/sakazuki/rde_en/

Erik Veenstra: Ruby
- Projects (Tar2RubyScript, RubyScript2Exe, RubyWebDialogs, AllInOneRuby), well documented; tutorials (Distributing Ruby Applications, Distributing Rails Applications, Monitor-Functions), Code Snippets.
- http://www.erikveen.dds.nl/ruby.html

DRP: Directed Ruby Programming
- Generative programming system, for genetic programming, grammatical evolution, or hybrid GP-GE; coded in all Ruby; best suited for interactive evolution and design work. Open source, GPL.
- http://drp.rubyforge.org/

Tesly Jr.
- Logs results of automated unit tests, and displays results in HTML view. RSS feeds track every test run.
- http://junior.tesly.com/

Play Ground of Ruby
- Small amounts of Ruby/Tk, SSI filter for HTML documents, initializer for multi-dimensional arrays, flock function checker, rot13, email counter/grapher.
- http://members.at.infoseek.co.jp/shiroikumo/ruby/index-en.html

Ruby/GP
- Genetic programming library in Ruby.
- http://www31.tok2.com/home/akimichi/aki/program/gp/

Ruby as Glue Language
- Ruby bindings for several libraries, programs, with readme files.
- http://www2s.biglobe.ne.jp/~Nori/ruby/

Ruby Binaries
- Cygwin DLL; GTk+ on Win32 DLLs; bmingw; rb2exe, turns Ruby scripts to executable files, which need Ruby interpreter.
- http://www.os.rim.or.jp/~eban/

Rinn
- CORBA for Ruby. Goal: a pure Ruby version based on CORBA-Ruby Mapping Specification.
- http://sourceforge.net/projects/rinn/

BioRuby
- Ruby library; goal: implement integrated environment for bioinformatics research in Ruby. Kept simple to maximize usability, efficiency for biologists as a daily tool. Begun in Japan, supported by Universities of Tokyo, Kyoto; Open Bio Foundation.
- http://bioruby.org/

AESCrypt
- Program to encrypt/decrypt streams of data using Rijndael and Cipher Block Feedback mode (CFB-128), for shell scripts and Ruby. Description, downloads.
- http://aescrypt.sourceforge.net/

RubyCocoa
- Ruby/Objective-C bridge for Mac OS X with Cocoa; Cocoa bindings for Ruby. Allows native OS function mixins and GUI component use, write Cocoa programs in Ruby, mix Ruby and Objective-C code, create and use Cocoa objects in Ruby scripts. English, Nihongo.
- http://rubycocoa.sourceforge.net/

WxRuby
- Ruby bindings to the wxWindows cross-platform toolkit; documents, references, Wiki, downloads. [Open source]
- http://wxruby.rubyforge.org/wiki/wiki.pl

RUDL Library
- Interfaces the Simple Directmedia Library to Ruby, giving it high speed graphics, sound, and input abilities. Links to related projects. [Open source, LGPL]
- http://rudl.sourceforge.net/

Yoshidam's Secret Page: Ruby
- Information on Ruby, powered by his XML module. Modules: XMLParser, Uconv, Oracle, VFlib3, Perl, Multibyte Extension for String class, Syslog; Libraries: Unicode, Susie Plugin, DirectDraw for Ruby, MDN.
- http://www.yoshidam.net/Ruby.html

RZBD
- Ruby Zebedee: 100% compatible clone (protocol, configuration file), can be used by Ruby scripts easily like standard Socket API. Zebedee is simple program to form encrypted, compressed tunnel for TCP/IP or UDP data between two systems.
- http://www007.upp.so-net.ne.jp/kengai/zebedee/rzbd.html

Numerical Ruby
- Modules: NArray class for Numerical N-dimensional Arrays; Quanty (units) class containing value and unit, for automatic unit conversion and calculation; link to PGPlot graphics library interface.
- http://narray.rubyforge.org/

LoveRubyNet
- Software Archive, many projects. Examples: Racc, LALR(1) Perser generator; TMail, Mail Class (implements MIME multipart, more); strscan, extension to scan string faster. English and Japanese versions. Ruby-dev summary index. By Minero Aoki.
- http://www.loveruby.net/

Motoyuki Kasahara's Page
- Ruby tools: find2 replaces find.rb, getoptlong library to parse command line options. Other free software.
- http://www.sra.co.jp/people/m-kasahr/

About Ruby
- Scripts and libraries, Pcap libpcap interface, Python embedded in Ruby, Ruby SWIG module. By Masaki Fukushima.
- http://www.goto.info.waseda.ac.jp/~fukusima/ruby/index-e.html

Hipster's
- Dozens of Ruby programs. Examples: reverse dependency tool, simple HTTP daemon, vim syntax coloring, Design by Contract, Literate Ruby, Fibonacci generators, generic XML generator.
- http://www.xs4all.nl/~hipster/

YAML.rb is YAML for Ruby
- YAML4R is a full-featured YAML parser and emitter for Ruby. Use as drop-in replacement for PStore, or use one of its several APIs to store object data in friendly and readable YAML style; write data structures in plain text.
- http://yaml4r.sourceforge.net/

MySQL/Ruby
- MySQL API module (extension library) for Ruby; gives same functions to Ruby programs that MySQL C API gives to C programs.
- http://www.tmtm.org/en/mysql/ruby/

AspectR
- Module adds simple aspect-oriented programming concepts to Ruby; allows wrapping code around extant methods in classes, which separates different concerns into different parts of the code. [Open Source, GPL]
- http://aspectr.sourceforge.net/

Rockit
- Ruby O-o Compiler construction toolKIT; easy-to-use, written in and emits Ruby code. Current focus: 'front-end' phases of compiler construction; generates lexer and parser (more advanced than yacc's LaLr(1), grammars in Extended Backus-Naur form.
- http://rockit.sourceforge.net/

ncurses-ruby
- Ruby module; makes most functions, constants, and external variables of the C ncurses library accessible from Ruby.
- http://ncurses-ruby.berlios.de/

RubyInline
- Analog to Perl's Inline::C, allows embedding C external module code in Ruby scripts directly; code is compiled and run on the fly, as needed. [open source, MIT License]
- http://sourceforge.net/projects/rubyinline/

HighLine
- High level library to deal with text user interfaces, build command line interfaces. Robust formatting has word wrap, paging, and list handling are possible. Handles validation rules for user input, implements menus easily. [Open source, GPL or Ruby Licen
- http://highline.rubyforge.org/

RubyUnit
- Simple testing framework for Ruby. Descriptions, downloads.
- http://homepage1.nifty.com/markey/ruby/rubyunit/index_e.html

FreeRIDE
- Ruby Integrated Development Environment, IDE. Wiki format, descriptions, FAQ, documents, screenshots, development and subproject links. Linux, Unix, Windows. [Open Source]
- http://freeride.rubyforge.org/wiki/wiki.pl

Arachno Ruby
- Commercial IDE, with integrated debugger, useful for normal and Web programming, applications. [Scriptolutions]
- http://www.ruby-ide.com/ruby/ruby_ide_and_ruby_editor.php