Canonical-library-example is a project mainly written in Ruby, it's free.
Just a skeleton of a Ruby lib that conforms to the no rubygems, no $LOAD_PATH mucking rule
It's basically a structure demonstrating the canonical way to write a ruby libary, without mucking with LOAD_PATHs, or requiring rubygems anywhere.
rake test # ruby -Ilib:test test/*.rb basically
You can do something like
> irb -Ilib
require 'sinefunc/gamers'
Sinefunc::Gamers::Wilders.speak # autoloads wilders module
=> "hello"
Alternatively you can also pre-require the library
> irb -Ilib -rsinefunc/gamers
Which basically has the same effect as the previous example.