#Group

Bulk operations for group users/roles/owner.

Select groups to modify, and get this form to make changes.

ECA/VBO actions for group.

The VBO action is very clunky to use in practice. You need to know the group ID to assign it to.

Add a field to content entities to select the group to add them to.

Create groups with private content.

There are lots of additional modules with extra features.