|Developer(s)||Laurent Sansonetti (Apple Inc.)|
|Stable release||0.12 / June 11, 2012|
|Written in||C, C++, Objective-C|
|Operating system||Mac OS X|
|Type||Ruby programming language interpreter and compiler|
MacRuby was an implementation of the Ruby language that ran on the Objective-C runtime and CoreFoundation framework under development by Apple Inc. which "was supposed to replace RubyCocoa". It targeted Ruby 1.9 and used the high performance LLVM compiler infrastructure starting with version 0.5. It supports both ahead-of-time and just-in-time compilation.
MacRuby supported Interface Builder and shipped with a core library called HotCocoa to simplify Cocoa programming. MacRuby was also used as an embedded scripting language for Objective-C applications.
The MacRuby project, per https://github.com/MacRuby/MacRuby/issues/231 is now dead and no longer under active development - it does not work on Mavericks, the team having shifted their focus to a commercial RubyMotion product exclusively for iOS. Development on MacRuby effectively ended in late 2011, coinciding with the principal author's departure from Apple Inc.
MacRuby was originally called "ruby+objc" and was developed by Laurent Sansonetti, who began work on it in late 2007. In March 2008, the first publicly available version, MacRuby 0.1, was announced on the official RubyTalk forum. Version 0.2 was released in June 2008, and implemented Ruby strings, arrays and hashes as native Cocoa types. In September 2008, MacRuby 0.3 was released and included the HotCocoa library as well as several HotCocoa example programs. In October 2008, Apple created its first MacRuby page on its Developer Connection website. MacRuby 0.4 was released in March 2009, MacRuby 0.5, 0.6, 0.7 in January, May and October 2010 respectively. MacRuby 0.8, was released on December 13, 2010, 0.9 on February 25, 2011  0.10 on March 23, 2011, 0.11 on October 17, 2011, 0.12 on June 11, 2012.
- http://lists.macosforge.org/pipermail/macruby-devel/2012-June/008842.html MacRuby 0.12 release note
- http://forums.pragprog.com/forums/76/topics/687#posts-4160 Discussion of MacRuby as a replacement for RubyCocoa
- http://www.infoq.com/news/2008/10/macruby-embedding Embedding MacRuby For Application Scripting
- RubyMotion - About. RubyMotion.com. Retrieved July 20, 2012.
- http://chopine.be/lrz/diary/2007-12-07_ruby-objc-Part-1.html Developer Laurent Sansonetti first discusses "ruby+objc" (which became MacRuby) on his blog
- http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/294485 Ruby-Talk: MacRuby 0.1 announcement
- http://www.macruby.org/post/44/ MacRuby 0.2 described at MacOS Forge
- http://www.macruby.org/post/macruby-03 MacRuby 0.3 announcement
- http://www.macruby.org/trac/wiki/HotCocoa HotCocoa Core Library page
- http://www.macruby.org/trac/browser/MacRuby/tags/0.3/sample-macruby/HotCocoa HotCocoa examples
- http://developer.apple.com/mac/articles/scriptingautomation/cocoaappswithmacruby.html MacRuby page at Apple Developer Connection
- http://www.macruby.org/blog/2010/12/13/macruby08.html MacRuby 0.8 announcement
- http://lists.macosforge.org/pipermail/macruby-devel/2011-February/007227.html MacRuby 0.9 release notes
- http://lists.macosforge.org/pipermail/macruby-devel/2011-February/007228.html MacRuby 0.9
- http://lists.macosforge.org/pipermail/macruby-devel/2011-March/007389.html 0.10 - update
- http://lists.macosforge.org/pipermail/macruby-devel/2011-October/008168.html brace yourselves, 0.11 is coming!
- Official website
- MacRuby download
- Developing Cocoa Applications Using MacRuby
- MacRuby presentation during RubyConf 08 by Laurent Sansonetti (video)
- OS X Application Development with HotCocoa by Rich Kilmer (video)
- Introduction to MacRuby (slides)
- MacRuby to the Max presentation during RubyConf India 2010 by Brendan Lim (slides)
- MacRuby: The Definitive Guide
- MacRuby's Twitter account
- Fool's Ruby and Cocoa Workshop - MacRuby Archive
- MacRuby Core Data Tutorial
- Using MacRuby with Snow Leopard