rpheath

google_ajax_libraries_api

Rails plugin: implements Google's Content Delivery Network for all javascript libraries currently supported by their library API.

has_params

Rails plugin: allows for checking the params hash in a cleaner fashion by using methods instead of the hash directly.

easy_search

Provides a nice and easy DSL to search ActiveRecord models.

acts_as_lookup

Rails plugin: provides a convenient way to deal with lookup tables and drop downs menus.

input_css

Rails plugin: provides a default CSS class on all INPUT fields based on the type attribute - perfect for designers.

navigation_helper

Rails plugin: provides automatic navigation for RESTful architectures, and has simple support for those that aren't.