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Javascript Tools provides a common set of methods extending those available in Drupal core (drupal.js) for Javascript and AJAX module development in Drupal.

Note: you should not install this module for Drupal 6 unless it is required by another module.

Note: As of Oct. 20, 2009, the 5.x version is no longer supported.

Prior to Drupal 6, Javascript Tools included an integrated set of Javascript and AJAX modules. For Drupal 6, modules previously part of Javascript Tools now have the following separate projects:

Active menus, http://drupal.org/project/activemenu (requires Javascript Tools 6)
Collapsiblock, http://drupal.org/project/collapsiblock (requires Javascript Tools 6)
Tabs: http://drupal.org/project/tabs
Active edit, http://drupal.org/project/activeedit (prototype only as yet, not usable)
Ajax submit, http://drupal.org/project/ajaxsubmit

Install Javascript Tools 6 only if you use Active menus or Collapsiblock or another module that requires it.

Backports Drupal 8 functionality into Drupal 7.

A simple bookmarks module with some advanced features like

The Node Access Arbitrator is an experimental module API designed to allow multiple node access systems to work together.

Currently it is 4 modules

Macromedia Contribute is a website management tool with a WYSIWYG editor and permissions management. It is nice (but not unique) in that you can force the user to choose styles from a specific style sheet and you can hide your php snippets and other stuff. This module allows you to display the content of html files which are maintained by Contribute (somewhere else on the same server).