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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Spell checkers needed - Wikipedia:Typo Team/moss got a complete update from the August 20, 2019 database dump. The project hosts lists of articles with misspelled words, words missing from Wiktionary, and unknown words that need investigation. Stop by and experience the satisfaction of fixing all the misspellings in an article!