Grouptool is another new plugin developed by AMC Academic Moodle Cooperation which enhances the functionality of Moodle default groups. Two of the additional features are the possibility for students to enroll themselves in groups with waiting lists, and the transfer of grades within groups.
Acc. to the plugin description:
The grouptool module features the following functionalities:
automatic creation of groups with simultaneous enrolment of participants (optional)
groups with pre-defined numbers of persons or groups
groups with certain pre-defined group names, consisting of [lastname], [firstname], [idnumber], [usernumber], numbers, alphabetical indexes, and pure text
simultaneous creation of groupings for each group created
self-enrolment of participants in exisiting groups:
activate the groups and specify their order for each grouptool instance
use a waiting list system with optional limitation of the number of participants
define the maximum number allowed per group or for all available groups
allow each participant to enroll in several groups (min./max.)
group grades – transfer awarded grades to other group participants
automatically for all groups or just for some
select the participant from whom the grade is to be transferred
You can download the Grouptool plugin from the Moodle plugins database from this link and here is the complete documentation about using the plugin. The plugin is available for all Moodle versions from Moodle 2.6 onwards.