This latest release updates our support for the Java-based Ruby implementation, JRuby, which is now a very good, mature product with a decent Windows installer. The Ruby In Steel editor and integrated console supports multiple versions of Ruby: 1.8.x, 1.9.1 and JRuby 1.4. In addition, we have two debuggers - one for Ruby 1.8 and another for JRuby 1.4.
Ruby In Steel 1.5 supports named Build Configurations so you can quickly swap Ruby interpreters for running or debugging by selecting a configuration name from a drop-down list (as shown above).
More on the SapphireSteel Software web site: http://www.sapphiresteel.com/Ruby-In-Steel-1-5-Released