The following is a list of some popular third-party Moodle add-ons (in alphabetic order), available through Modules and plugins link at http://moodle.org, as well as a brief description for each plug-in:
Accessibility Options (Block)
The block allows students to change the font size and background color of their Moodle site.
ActiveUsers (Block)
The configurable block displays the most active users along with a ranking. Each user is a given a rank calculated as the Z score of the number of hits.
Book (Activity Module)
This activity allows users to create multi-page resources in a book-like format.
Certificate (Activity Module)
The fully customizable activity generates PDF certificates for students.
Feedback (Activity Module)
The activity module allows users to create and conduct surveys to collect feedback. The module is planned to be included in the core of Moodle 2.0. We will be using the Feedback module as an example for installing a third-party add-on later in...