2. Ar mailerfork of ar_mailer gem by Eric Hodel that allows deferred batch sending of emails for Rails apps
3. Active enumDefine enum classes in Rails and use them to enumerate ActiveRecord attributes, with I18n support
4. Validates timelinessDate and time validation plugin for ActiveModel and Rails. Supports multiple ORMs and allows custom date/time formats.
6. cronosTool for generating cron task intervals using a natural syntax