Popup Vertex Group List is an add-on that provides a quick-access dialog showing all vertex groups for a selected mesh. It allows you to quickly set the active vertex group, streamlining the weight painting process. When vertices are selected, the tool displays a 'Relevant Groups' menu, highlighting only the groups that contain weights for those specific vertices.

The add-on includes an option to automatically select the corresponding pose bone when a vertex group is chosen, provided the bone exists. Users can customize the layout of the popup dialog by adjusting the number of vertex groups displayed per column, allowing for control over the height and width of the interface.