Userscripts.org

Automatically "likes" videos from users you choose, or anybody.

A script to add an rss feed button to youtube videos.

Adds a button that redirects to KeepVid's YouTube download service for the video you are currently watching.

Enhances your pirating experience by adding torrent links to iMDB, Rotten Tomatoes (and MovieFone, soon).

Adds a menu under YouTube video with available MP3 files found on ZippyShare and Hulkshare.

Make the YouTube dislike bar red again.

Shows a high quality link by the description of a video.

Adds the national flag icons next to each username in the comment section of Youtube.

Hides comments, preserves brain cells. Click headers to toggle.

Removes main youtube ads, does not remove in-video ads.

Skips the das captcha page on YouTube

Schnell navigieren in der Zeitleiste.

Allows you to use customizable seek times to skip intros on a series or anything you might need

Completely removes the annoying gray playlist at the bottom of YouTube. (In opposition to just hiding it.)

Removes unnecessary parameters from links like feature=channel

Hide the videos you've already seen

By Theofilaktos Spendas, this script Clicks the youtube Like button on visit of a youtube video

Well It Changes The Look of Animecrazy And Moves Some Links Just started this Project

Removes the "Your Subscriptions" quicklist footer at the bottom of the page in Youtube when watching videos.

Adds FLV, MP4, 3GP, and 720p download links to YouTube.

Makes youtube in HD.

Stop Autoplaying Video On YouTube Profiles

Adds extended functionality to the youtube player such as player refreshing if video stops loading, user specified seek ahead, stop video loading, and more

Creates links under embedded youtube videos and shows thumbnails when hovered over

Shows hidden thumbed-down comments that can't normally be seen

Uses the JW Player for youtube. Has options in the user script commands

Strips youtube videos, flash objects, iframes, custom styles, and applications from profiles

Adds a "By Date" button next to the search button

Automatically pauses the video when you switch to a different tab or window, and automatically plays when you come back to it

Changes javascript links into direct links