MPI Ruby is a Ruby binding of MPI. The primary goal in making this binding was to make the power of MPI available to Ruby users in a way that fits into the language's object oriented model. In order to do this, the buffer and datatype management necessary in the C, C++, and Fortran bindings have been removed. What this means is that MPI Ruby allows you to treat objects as messages. MPI Ruby also aims to be a complete binding to MPI, in that it offers access to nearly all functionality of MPI.
quote.rb is a Ruby script which defines more than 70 quoters (basic string manipulation routines). Most quoters just add or remove backslashes at the appropriate place; others include hexdumps, checksums, simple encryptions, etc. quote.rb's main goal is to provide all quoters necessary for simple and advanced web programming (CGI and server-side scripting) in one place.
pRuby is the ultimate glue code between PHP and Ruby which lets you use Ruby as a HTML-embedded, server-side scripting language. With pRuby, you can intermix PHP and Ruby to create dynamic web content. It features better startup speed than CGI and PHP, better execution speed than PHP, more powerful and less messier to program than PHP, cross-language function calls, and cross-language error handling.
flex.rb is a regexp matching and scanning library for the Ruby language. It is more than 3 times faster than Ruby regexps, and supports matching text arriving in multiple parts (via async, non-blocking I/O). flex.rb embeds the GNU Flex 2.5.4 (fast lexical analyzer generator) as an engine, and all of Flex's functionality is accessible from Ruby scripts.