This category is for different versions of Ruby, which are considered and called different implementations. For all programming languages, significantly different versions of the language are considered different implementations. In most languages, this is an independent issue from the language's compilers/interpreters and environments. In other words, most languages can have different compilers and environments, for the same implementation.
To this category, please submit only different variations of the Ruby programming language. Submit Ruby software and enhancements to the Software subcategory.