Advanced Search Helper when search box is focused. Bookmark search queries for reuse. Other navigation improvements.
A one-stop pinned tab, always checking for review opportunities on main and meta as aggressively as is useful between multiple sites you configure.
You got a small monitor? No problem! Install this user style to browse Stack Overflow without having to zoom out. DOWNLOAD NOW FOR FREE! (From userstyles.org)
A UserScript for Meta that makes it extremely simple to draw Freehand Circles™ on any image in a post. The script even goes as far as updating the post with the new image for you.