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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.
Useful tools to add to courses or home pages
Change the look and feel of your site or course
Course formats (24)
Change the structure/layout of course pages
Filters can process and change text
There are several ways to extend the gradebook
General plugins go into the /local directory and do not fit into any particular category.
Redirect messages to other places
Connect to repositories of files
Export user content to other systems
Connect to different plagiarism services
Beyond REST, SOAP, AMF and XML-RPC ...
Various types of calendar systems
Useful code that does conform to any standard plugin type
Various software that is not implemented as a Moodle plugin yet may provide useful functionality related to Moodle.
Moodle plugins that require specific environment, extra attention during the installation, or custom core patches applied to make them work.
Moodle plugins that do not yet meet all the different standards and criteria to be listed in the matching plugins category.
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.