I got an app a long time ago (called SourceTree) that adds an option to Finder's context menu. The way I installed the app was by simply moving it to my Applications folder, and it didn't come with an uninstaller. I transferred all my stuff to my new computer via Time Machine, and the option in Finder is unfortunately still there. How can I get rid of it without re-installing the operating system?
See the last option in this context menu: