jRails is a drop-in jQuery replacement for Prototype/script.aculo.us on Rails. Using jRails, you can get all of the same default Rails helpers for javascript functionality using the lighter jQuery library.

This is the initial release of jRails and covers all of the functionality in the built in Rails prototype_helper as well as some of the functionality in scriptaculous_helper. This release includes support for basic AJAX calls (form_to_remote, link_to_remote), RJS, observers (observe_form, observe_field) as well as a limited set of functionality for draggables, droppables, sortables and visual effects. Support will continue to grow as the jQuery UI and FX libraries mature.