You are browsing the old Contao 3 extension repository. Contao 3 is no longer maintained as of June 2019! You can find the Contao 4 extensions on extensions.contao.org.
Extensions > associategroups
Creates an association table for member and user groups
This extension is intended for developers only!
After installing this extensions, the system will maintain two new tables called tl_member_to_group and tl_user_to_group. These table hold references for group assignments, allowing you to be able to search for members/users belonging to a give group (id).