We've added three very nice new plugins here.
The first is:
This is a great little plugin that allows teachers, or even learners(!), to create Mindmaps right in Moodle, no external software required. It's quite simple, but that is it's strength.
Unfortunately both of these are administrator level only, but we've added a description and screenshot so you can quickly decide whether to investigate further
Link crawler robot can run through your Moodle site and find broken links (internal or external, e.g. to websites). Kopere Dashboard is a feature packed admin plugin with performance, reports, backups, and all sorts of useful things!