User Mentions Improvements is an advanced system for mentioning XenForo 2 users.

Info:

Features:
Sorting user groups.
Customizable icon for each group (small + large).
A group can be closed to mentions, and only members of this group can mention them.
Administrator rights to view all groups tagged with tags.
User messages/user comments.
Sending a mention to the user who was mentioned.
Editor integration. Copying and pasting the user group tag link is converted to @usergroup.
User mentions can be disabled for each forum and for each user group.
And much more.