SearchSuite is a userscript that provides user control over search results: it can strip them down to a single-spaced list, sort, and more. Most of its features are presented as menu item toggles to turn each feature on/off. Each menu-item-controlled feature works on the output of all the others, in both their on and off states. Feedback and feature suggestions welcome.
Do you have need for a specialized script that doesn't exist yet, or have an idea for a cool new script or gadget? Post requests and ideas at Wikipedia:User scripts/Requests.
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Wikipedia:Typo Team/moss just got a fresh batch (from the July 20, 2018, database dump) of articles with misspelled words, and words missing from Wiktionary. Stop by and experience the satisfaction of fixing all the misspellings in an article on the topic of your choice!
At the top of each section of an article (if it has sections, that is), located on the far right of the screen, is an  button. The button is offset slightly above the section, and sometimes new users get confused and think it belongs to the section above it. When you click on the edit button, the edit window opens up, displaying the source text from the section immediately below the edit button. Please use these whenever you can. You can set your preferences to have the section headers themselves to act like the  links.