AppCleaner software version 3 is a lightweight application designed to thoroughly uninstall unwanted apps from your Mac system. The software searches for all related files and folders associated with the unwanted apps and safely erases them, thus freeing up storage space. It supports a drag-and-drop feature to quickly select apps for removal and also includes a "SmartDelete" function that detects when an app is trashed and offers to remove any left-over related files. Additionally, AppCleaner version 3 introduces a feature allowing users to manage widgets, plug-ins and preference panes.