Moodle plugins listed in this category do not yet meet all the different standards and criteria to be listed in the matching plugins category. They may be eventually re-evaluated and propagated once the detected issues are fixed.
Important Plugins here may requires special attention during the installation, and sometimes even needs hacks to core.
Plugins in this category are excluded from automatic updates. The code here is more likely to break when you upgrade Moodle and we generally do not recommend installing it unless you have Moodle developers on hand to help maintain it.