group_permissions

Group module is a great solution for your community and other types of web sites, but it only allows you to set your permissions based on a group type. Group permissions module allows you to use group type permissions as default ones and completely override permissions on the a group level.

In this case:
1) It is not necessary to add multiple group types for every case when you need custom permissions
2) It is much easier to control permissions and the same time apply the same configuration for all your groups
3) It gives the full freedom to control your permissions per a group
4) it is always possible to restore default permissions
5) From alpha 4 we have support of revisions. So, you can see a history of changes

Group permission 1.0

If you face this error

InvalidArgumentException: $string ("") must be a string. in Drupal\Core\StringTranslation\TranslatableMarkup->__construct() (line 132 of /home/lob/www/drupal_group_1/web/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php).

or this

Warning: Undefined array key "title" in web/modules/contrib/group/src/Access/GroupPermissionHandler.php line 183

Please apply this patch for Group module. Unfortunately, the author of Group module doesn't want to support Group 1.0 anymore.

Group permission 2.0

This release could be used for both Group 2.0 and Group 3.0