Group It! Add-On brings object grouping to Blender through a two-click flow. Select two or more objects, press the Group button, and the add-on parents them together inside a Grouped Cube. The Ungroup button reverses this, removing the parent and deleting the bounding cube. The ungroup, duplicate, and delete group options appear only after you click the Grouped Cube.
The add-on covers the full lifecycle of a group. You can duplicate a group along with the objects inside it using the Duplicate Group button or the CTRL+SHIFT+D shortcut, and remove a group and its contents with Delete Group. Real-time Auto Resize keeps the Grouped Cube fitted to its objects as they move, and this option can be turned on or off. Lock Group and Unlock Group control whether objects inside the cube can be edited.
Additional options include assigning colors to Group Cubes to identify them when a scene holds many groups, an "Objects in group unselectable" checkbox, group renaming, and an improved UI. The Grouped Cube also supports Cycles render mode. A demo video is available.