This is a list of the 30 most downloaded Ruby projects (according to RubyForge).

Rank Project Downloads
1

One-Click Ruby Installer

A self-contained installer that includes the Ruby language, dozens of popular extensions, a syntax-highlighting editor and the book "Programming Ruby: The Pragmatic Programmer's Guide". Platforms: Windows NT/2000/XP.

3,388,112
2

RubyGems

RubyGems is the Ruby standard for publishing and managing third party libraries.

1,849,808
3

Rails

Rails is a web-application framework for the MVC pattern that includes both a template engine, controller framework, and object-relational mapping package. Everything needed to develop web-apps that can run on CGI, FastCGI, and mod_ruby.

1,126,324
4

Rubot

Feature-rich framework for easy development of MediaWiki bots. Contains a stand-alone base library, utilities for common tasks and adapters for advanced bots (monitoring, analysing, etc). Is able to use MediaWiki's build-in API but can even run without!

784,969
5

Instant Rails

Instant Rails is a one-stop Rails runtime solution containing Ruby, Rails, Apache, and MySQL, all pre-configured and ready to run. No installer, you simply drop it into the directory of your choice and run it. It does not modify your system environment.

775,600
6

FLVTool2

FLVTool2 is a manipulation tool for Macromedia Flash Video files (FLV). It can calculate a lot of meta data, insert an onMetaData tag, cut FLV files, add cue points (onCuePoint), show the FLV structure and print meta data information in XML or YAML.

279,775
7

PHPRPC for Ruby

PHPRPC is a Perfect High Performance Remote Procedure Calling that works over the Internet. It's secure and fast. It has a smaller overhead. It's powerful and easy to use. This project is implements of PHPRPC client and server for Ruby.http://phprpc.org

234,707
8

RMagick

An interface to the ImageMagick and GraphicsMagick image processing libraries. Supports over 100 image formats, including GIF, JPEG, PNG. See rmagick.rubyforge.org for prereqs, install FAQ, more.

224,465
9

Net::SSH

Net::SSH is to SSH as Net::Telnet is to Telnet and Net::HTTP is to HTTP. Perform non-interactive SSH processing, purely from Ruby!

151,580
10

Rake

Rake is a Ruby make-like utility using standard Ruby syntax for the build specification file.

143,289
11

Ruby

Main Ruby language project for providing a mirror of the Ruby releases, tracking bugs, etc.

135,954
12

ActiveRecord

Implements the ActiveRecord pattern (Fowler, PoEAA) for ORM. It ties database tables and classes together for business objects, like Customer or Subscription, that can find, save, and destroy themselves without resorting to manual SQL.

132,606
13

SQLite-Ruby

A Ruby interface for the SQLite database engine.

126,631
14

Active Support

Utility classes and extension to the standard library that were required by Rails, but found of general use.

124,618
15

Win32 Utils

The Win32Utils project is a series of libraries that provide Ruby interfaces to various Windows systems and services. This project only supports Windows 2000 and later.

123,945
16

Redmine

Redmine is a flexible project management web application: issues tracking, news, documents and files management. Issue tracking is now hosted at www.redmine.org

123,804
17

Instiki

A wiki clone pretty and easy to set up. Runs on Rails and focuses on portability and stability. Supports file uploads, PDF export, RSS, multiple users and password protection. Some use Instiki as a CMS because of it’s ability to export static pages.

118,983
18

Action Pack

Eases web-request routing, handling, and response as a half-way front, half-way page controller. Implemented with specific emphasis on enabling easy unit/integration testing that doesn't require a browser.

118,170
19

Seattle.rb Projects

Seattle.rb's treasure-trove! hoe, ruby2ruby, image_science, rails_analyzer_tools, flay, flog, and many many others.

108,127
20

Watir

Watir is a testing tool for automating browser-based tests of web applications. It is a Ruby library that works with Internet Explorer and Firefox.

105,561
21

Ruby/DBI

Ruby/DBI develops a database independent interface for accessing databases - similar to Perl's DBI.

100,730
22

Nitro

Nitro is an efficient, yet simple engine for developing professional Web Applications using the Ruby language.

100,277
23

Action Mailer

Simplifies the creation of mail service classes that uses Action View (from Action Pack) to render the body templates.

98,866
24

codeforpeople

dozens of ruby libraries released by codeforpeople.com

94,342
25

FreeRIDE

The FreeRIDE project is a pure Ruby Integrated Development Environment.

93,024
26

typo

Typo is a lean weblogging engine powered by rails. It supports XMLRPC posting, ping/trackback, comments, textile, markdown, categories, all common exports, fulltext search and so on.

86,618
27

Mongrel

A small fast HTTP server for Ruby and JRuby that can be used to host web frameworks directly with HTTP. Please report tickets on the Mongrel website: http://mongrel.rubyforge.org/ .

78,763
28

ruby-oci8

ruby-oci8 is a ruby interface for Oracle using OCI8 API. It is available with Oracle8, Oracle8i, Oracle9i, Oracle10g and Oracle Instant Client. Use oracle module by yoshidam in RAA for Oracle7.

73,086
29

Action Web Service

Simple support for publishing Web Service APIs for Rails applications. Supports SOAP and XML-RPC, as well as generating WSDL for SOAP bindings.

71,510
30

RDE

RDE is a Ruby IDE and editor on Windows. You can edit, run and debug scirpts on it. RDE is more light and quick than heavy other IDEs.

70,666

View the full list of the top 100 downloads at RubyForge…