MinimalOverflow adds a clean theme and theme toggler to Stack Exchange.
Adds comment autocomplete (relatively) consistent with comment "@lert" rules, as well as a number of useful utility links, like history and timeline
Stack Fiddle makes sending code from SO to jsFiddle easy. It adds headers to the code blocks on Stack Overflow (and other Stack Exchange sites) for you to choose and send straight to jsFiddle.
Make chat even more awesome by adding in extensible commands and keyboard navigation
Stick the userbar to the top of the window
Avid chatter? This version of SO Live announces reputation updates as they happen at the top of every Stack Exchange chat. (Only reputation updates from the site that "sponsors" the room are shown.)
hide pointless user data on userscripts.com When I look at answers, I often take the user's reputation into account on whether I upvote them or not. This is a terribly bad thing to do as you shou…