ActiveRecord PostgreSQL Adapter extension for using a cursor to return a large result set
[For Rails >=3.0 see afair/postgresql_cursor] Ruby on Rails (<= 2.x) plugin to user PostgreSQL cursors.
The EmailAddress Gem to work with and validate email addresses.
Resque ported to perl
Ruby gem to interact with the Qmail MTA
Easy Money handling for Ruby instance attributes and methods. Converts between a values stored as integer with an implied precision (cents) and a human-readable/writable money format