known

# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-p370]
[ruby-]1.9.1[-p431]
[ruby-]1.9.2-p180
[ruby-]1.9.2-p290
[ruby-]1.9.2-p318
[ruby-]1.9.2[-p320]
[ruby-]1.9.2-head
[ruby-]1.9.3-preview1
[ruby-]1.9.3-rc1
[ruby-]1.9.3-p0
[ruby-]1.9.3-p125
[ruby-]1.9.3-p194
[ruby-]1.9.3-[p286]
[ruby-]1.9.3-head
ruby-head

# GoRuby
goruby

# TheCodeShop - MRI experimental patches
tcs

# JRuby
jruby-1.2.0
jruby-1.3.1
jruby-1.4.0
jruby-1.6.5
jruby-1.6.5.1
jruby-1.6.6
jruby-1.6.7
jruby-1.6.7.2
jruby[-1.6.8]
jruby-head
jruby-1.7.0.RC2

# Rubinius
rbx-1.0.1
rbx-1.1.1
rbx-1.2.3
rbx-1.2.4
rbx[-head]
rbx-2.0.testing

# Ruby Enterprise Edition
ree-1.8.6
ree[-1.8.7][-2012.02]

# Kiji
kiji

# MagLev
maglev[-head]
maglev-1.0.0

# Mac OS X Snow Leopard Or Newer
macruby-0.10
macruby-0.11
macruby[-0.12]
macruby-nightly
macruby-head

# IronRuby -- Not implemented yet.
ironruby-0.9.3
ironruby-1.0-rc2
ironruby-head