Scriptler
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Google Disabler JS - A Script, which basically disables google, while allowing people to still access the site. Use next April Fools, to prank your firends, or to lock your google with a backup password.
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uScript+ JS - Helps the Userscript development process. Add hooks to arrays, objects, etc. It may be very useful for many purposes, while having config options that allow for customizeability. And is also useful for reverse-engineering a website, as you can see what is happening when, say a click event occurres.