Collections Pie is a Blender pie menu from Hard Surface Professor for working with collections in the outliner. It gathers a range of options for adding collections to specific parts of the outliner quickly, without doing the work by hand. The menu appears in the N panel.
Options include isolating all objects in the collection of the active selection, without needing to select them all first. You can add a collection within a collection, below it, or below the selection's parent collection. It can also move an object to the active selection's collection or to the active collection's parent collection, and it includes Blender's default collection menu at the top.
Collections Pie supports Blender 3.5, 3.6, 4.0, 4.1, 4.2 and 4.3, and is released under the GPL license. Installation is handled through the Preferences panel by selecting the Collections_Pie file. The same pie menu is also included in the developer's Modeler Pro modeling kit. Version 1.0 is the most recent release.