When it sees a link to a userscript or general Javascript URL, adds a Bookmarklet besides it, which you can drag to your toolbar to load the script when you next need it (running outside Greasemonkey of course).

Shows Delicious info for the target page in a tooltip when you hover over a link.

The red notifications dots on Quora are annoying, so let's make them grey. Also hide the popups, separate adverts from content, don't keep opening new tabs, and add some whitespace for readability.

No mousewheel? No problem! This script will scroll the page if you place your mouse near the top or bottom of the window and wiggle it.

Make the guardian great again!

Add History box at wikimedia's leftmost column

Load more results automatically and endlessly.

On pages which do not have a Table of Contents, but should do, create one! (I actually use this as a bookmarklet, so I can load it onto the current page only when I want it.)

Adds a "visited" colour to pouet.net, so you can see which pages you have already visited.

Add a ! to the end of your google search to perform a lucky search

Quick scroll to next/previous image on a page with n/p buttons

Adds some extra keystrokes to Firefox.

Intercepts console.log calls to display log messages in a div floating on the page. Tries to be a replacement for normal browser Error Consoles (which can be a little slow to open).

Makes READMEs on npmjs.com look more like READMEs on GitHub (font, size, padding, some colors); also makes the content wider

Puts the video title in the location bar of all YouTube video pages. Now with extra features add scrollbars, animate thumbnails, reduce font sizes and un-float the header.

Change all Github repository and gist pages to be full width and dynamically sized.

If a tab is unused for a long time, it switches to a light holding page until the tab is focused again. This helps the browser to recover memory, and can speed up the re-opening of large sessions.

For any links (<A> tags) on the page which point to an image, show the image!

Preview screenshots straight from the prods search by hovering over links.

Minor visual tweaks to StackExchange (remove the new sidebar from Q/A pages, for classic look)

Extends DDG by adding a customizable list of additional search engines for making fast searches from other engines.

Adds a favicon for the website next to every external link on the page. Clearly shows when you will be leaving the current site, and where you will be going! (Unfortunately making links longer than expected can result in unwanted overflow on various websites. For example, Google header bar!)

Adds a hover event to internal article links on wikipedia pages which, opens the article inline in a dhtml frame.

When you paste a URL to a friend, it is useful if it contains the title of the page. This script adds these missing titles for common websites using # part of URL. In other words, it turns non-semantic URLs into semantic URLs!

Read articles hands-free! Pres Ctrl-Down or Opt-Down to start slowly scrolling the page. Press again to adjust speed. Escape or Space to stop.