Ruby-VPI is a Ruby interface to Verilog VPI. It lets you create
complex Verilog test benches easily and wholly in Ruby.
Website: http://ruby-vpi.rubyforge.org
Tutorial: http://ruby-vpi.rubyforge.org/doc/usage.tutorial.html
Download: http://rubyforge.org/frs/?group_id=1339&release_id=6332
SVN tag: svn://rubyforge.org/var/svn/ruby-vpi/tags/0.9
Version 0.9 (2006-08-07)
Summary
This release adds support and documentation for rapid prototyping
of Verilog designs in Ruby.
Details
* Support for prototyping designs in Ruby, before they are
implemented in Verilog, has been added.
o The same specification can be used to verify both prototype
and design! 
o The tutorial in the user manual has been updated to discuss
prototyping.
+ Prototypes have been added to the counter example.
* The directory structure has been reorganized as follows:
o ext → src
o tools → bin
o examples → samp
* All template files have been moved into the tpl directory.
* The user manual has been revised for consistency.