AppCleaner is a small application which allows you to thoroughly uninstall unwanted apps.
Installing an application distributes many files throughout your System using space of your Hard Drive unnecessarily. AppCleaner finds all these small files and safely deletes them.
AppDelete is an application for Macs that will delete the application you choose and any associated items (files and folders) that belong to that application. Now you will no longer have to hunt through your system to find these items and delete them manually. Or worse, just let them sit on your Mac forever even though the application is long gone!
Fourteen languages: English, Chinese, Czech, Danish, Dutch, Finnish, French, German, Italian, Japanese, Portuguese (Brazilian), Russian, Spanish, and Swedish Quick-search panels with filters to find items for deletion fast (including old PPC apps) Hidden mode for full background operation Finds associated items that are invisible or hidden Orphans feature to find and remove "orphaned" files Archive/Install from Archive feature for safekeeping and transferring items to another Mac Sparkle updater to always have the latest version Preference to protect Default (Apple) apps Password requested only once if needed instead of multiple requests Keeps a Log of all activities and has the ability to Undo a deletion Moves items into an organized deleted package in your trash Force Empty Trash for stubborn to remove items
GrandPerspective is a small utility application for Mac OS X that graphically shows the disk usage within a file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space. It uses a so called tree map for visualisation. Each file is shown as a rectangle with an area proportional to the files size. Files in the same folder appear together, but their placement is otherwise arbitrary.
Regarding price from product webpage:
Download GrandPerspective from Sourceforge for free or from the App Store for $2.99. You'll get the same app either way.
So what's the difference? When you get it from the App Store you know that it has passed Apple's review and quality control, you receive automatic updates, you help cover distribution costs and you support further development.
dupeGuru is a free and open source tool to find duplicate files on your computer. It can scan either filenames or contents. The filename scan features a fuzzy matching algorithm that can find duplicate filenames even when they are not exactly the same. dupeGuru runs on Mac OS X, Linux, & Windows.