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Categories
Activities (264)
The main student activities in a course
Availability conditions allow teachers to restrict an activity or section so that only certain users can access it.
Blocks (246)
Useful tools to add to courses or home pages
Themes (114)
Change the look and feel of your site or course
Users (64)
Tools for managing users
Authentication (32)
Different methods of identifying users
Enrolment (23)
Customise how people get enrolled in courses
Add new fields to user accounts
Course formats (24)
Change the structure/layout of course pages
Filters (44)
Filters can process and change text
Reports (25)
Report plugins for administrators, teachers and general users.
Admin reports (0)
See reports about site activity. Replaced by the generic Report plugin type in Moodle 2.3.
Course reports (0)
See reports about course activity
Gradebook (13)
There are several ways to extend the gradebook
Grade reports (6)
Interfaces to view and manipulate grades
Exports (4)
Export grades to files or other systems
Imports (0)
Import grades from files or other systems
Grading methods (3)
Advanced grading methods (also known as grading forms) provide new interfaces for grading items in Moodle.
General plugins go into the /local directory and do not fit into any particular category.
Messaging (4)
Redirect messages to other places
Repositories (34)
Connect to repositories of files
Portfolios (2)
Export user content to other systems
Plagiarism (10)
Connect to different plagiarism services
Beyond REST, SOAP, AMF and XML-RPC ...
Admin tools (12)
Provides utility scripts useful for admins to examine and modify a Moodle site (2.2+)
Log storage (0)
Located in admin/tool/log/store (subplugins of tool_log core admin tool)
Calendars (3)
Various types of calendar systems
Other (27)
Useful code that does conform to any standard plugin type
Utilities (1)
Various software that is not implemented as a Moodle plugin yet may provide useful functionality related to Moodle.
Experimental (4)
Moodle plugins that require specific environment, extra attention during the installation, or custom core patches applied to make them work.
Incubating (3)
Moodle plugins that do not yet meet all the different standards and criteria to be listed in the matching plugins category.
Recently added plugins 
tool_heartbeat
A load balancer heartbeat / health checker url, and also a configurable nagios compliant cron health checker.
This should out of the box with most load balancers, eg Amazon ELB, F5, HA proxy etc as most of these simply check the http status for 200 or non-200 response codes.
atto_preview
An Atto editor plugin that shows a preview of the filtered editor content.
repository_xpert_url
The 'URL downloader (Xpert)' repository allows a user to attribute an image downloaded via a URL to the copyright holder
repository_xpert_upload
The 'Upload and attribute a file (Xpert)' repository allows a user to attribute an uploaded image to the copyright holder