The gradereport gradedist module allows for viewing the distribution of student grades for a course regarding the current grade letter boundaries as well as changing these to shift the distribution. This module depends on HighCharts for visualizing the grade distribution, see README.
The grouptool module (mod/grouptool) enhances the functionality of Moodle default groups. Two of the additional features are the possibility for students to enrol themselves in groups with waiting lists, and the transfer of grades within groups.
The module Download Center (local/downloadcenter) enables all users to download all files, folders as well as all documents of student folders of the entire course as a ZIP archive with a clear folder structure.