JRuby, YARV, Rubinius, and IronRuby are some of the alternative implementation of the Ruby language as of 2008 with each of them taking a diverge approach.
“JRuby” One of the strong features of JRuby is its capacity to invoke the classes of the Java Platform considering that it is a Java implementation of the Ruby and is closely incorporated with Java.
“YARV ” an acronym for Yet Another Ruby VM, it is a bytecode interpreter developed for the Ruby programming language with the goal of trimming down the execution time of Ruby programs
“Rubinius” it is clean, understandable code that is easy for users to comprehend and extend. It is a virtual machine and compiler for Ruby.
“IronRuby” an approaching implementation of the Ruby programming language that targets Microsoft .Net framework