From the FAQ[L1 ]:
``Ruby is a simple and powerful object-oriented programming language, created by Yukihiro Matsumoto (who goes by the handle "matz" in this document and on the mailing lists).
``Like Perl, Ruby is good at text processing. Like Smalltalk, everything in Ruby is an object, and Ruby has blocks, iterators, meta-classes and other good stuff.
``You can use Ruby to write servers, experiment with prototypes, and for everyday programming tasks. As a fully-integrated object-oriented language, Ruby scales well.''
The home page for Ruby is http://www.ruby-lang.org . You may also find http://www.rubycentral.com and http://www.ale.cx/mine/ good sources of Ruby information.
There is a Ruby/Tk[L2 ] if you want to bring your Tk skills into a new world.