Userscripts.org

Converts anchor tags with no attributes into bookmarks via the next available text node line

Removes annoying quiz and application messages also "became friend with", "is attending event", "became a fan", "joined a group" messages from your facebook homepage

Collapses "Ask me anything" posts and replies on Tumblr.

Uses CSS to fix positioning of <video> tags created by ClickToFlash on Youtube (For use with GreaseKit and ClickToFlash on Safari) Adds native support for clicking timecodes in comments by replacing the built-in function on YouTube. The <video>...

Finds RSS and/or Atom links on a page and inserts feed subscription links for use by aggregators.

No autoplay; buttons to play HD/HQ with MP4 or Flash plugin; download. Compatible with Firefox/Safari/Opera/Chrome/others, translated into English/Spanish/German/French/Italian.

Loads pages endlessly when scrolling on the Twitter timeline. Other features: remembers last read tweet, embedded location map, more dynamic interface, tab-completion of friend names and live updates with Growl notifications.

It overrides the flickr "Send to Group" button above your photo/video and lets you send your Flickr image or video to multiple groups simultaneously

Adds icons for Mail, Profile, Favourites, Scout, Interestingness, DNA, and the user's photo archive next to usernames in forums and on individual photo pages. It also allows you to send Flickr Mails without leaving the current page you are on.

Makes Emoji (絵文字, a.k.a. pictograms/emoticons) encoded in the Unicode Private Use Area according to SoftBank's scheme viewable in Firefox.

Ignore tweets that contains hashtags you specify.

Automatically selects "Catalog #" from the search dropdown and focuses the search field. NOTE: This script is compatible with GreaseKit.

Transform Blip.fm into something Fluid.app worthy. Removes 2nd column, and most margins. Shrinks play controls. Just the basics.

Improves on BitSoup's bookmarking system, adding ajax bookmarks on the browse, details, and wish list pages, and download links in the wish list view.

Provides a link to download a torrent from the Wish List page.

FavoriteSoup add a link to add a torrent to your BitSoup wishlist from the torrent description page instead of having to go back to the main listing.

Provides a quick "Thank the uploader" button."

D. Works the same as the bookmarklet, just with no clicking required. Tested in Fluid / Greasekit only.