A priority queue is like a standard queue, except that each inserted elements is given a certain priority, based on the result of the comparison block given at instantiation time. Retrieving an element from the queue will always return the one with the highest priority.

Sanitize and sterilize HTML, also includes a CSS filter.

Backload provides callbacks for Ruby's #require and #load methods.

Cuts is an expiremental implementation of cut-based AOP for Ruby written in pure Ruby.

Iteration is class that encapsulate an step in an each loop. It can be used to query infromation about an iteration easily.

Reusing makes it possible to use refinements without all the boiler plate normally necessary in their creation. Instead extension scripts can be loaded directly as refinements.