Do You Know The Ruby Calibre Project
The Calibre Project provides extensive general purposed library collections to supplement the core and standard libraries already included with Ruby. Examples include an ordered hash, module macros for dynamic mixins, attribute casters, etc. I longed for ordered hash. There seems to be little documents at the site. I hope the project will mature.
Paul van Tilburg, a Debian official developer, is packaging them. They will soon be available with Debian.