Aren't there anomalously MANY players in the Ruby language space?
* The super-important MRI/YARV team
* The mruby team
* The super-important MacRuby team
* The IronRuby team, to the extent it still exists
* The super-important JRuby team
* The super-important Rubinius team
Other languages also have multiple implementations, but they aren't really in viable competition with each other like they are in Ruby (a good thing for Ruby).
* The super-important MRI/YARV team
* The mruby team
* The super-important MacRuby team
* The IronRuby team, to the extent it still exists
* The super-important JRuby team
* The super-important Rubinius team
Other languages also have multiple implementations, but they aren't really in viable competition with each other like they are in Ruby (a good thing for Ruby).