To uninstall Remote Buddy, simply delete the copy you installed on your computer (you'd usually have dragged it to your /Applications folder).

If you also want to remove the preferences files, you can find these as

~/Library/Preferences/com.iospirit.*emote*uddy*

If you installed Remote Buddy plugins or behaviours, you can find these at

~/Library/Application Support/Remote Buddy

If you have used Remote Buddy with Music or iTunes, you can find its cache folder at:

~/Library/Caches/Remote Buddy

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