Userscripts.org

Makes Youtube's "Watch" page (video page) better with a variety of features and options including a right-side description, older video players, style improvements, and much more.

Attempts to securely delete your Reddit comments by editing with a random overwrite, and then deleting the newly edited comment.

Hides comments on Rock Paper Shotgun.

Allows Toggling of Youtube Comments via button. It has options now! Chrome, Firefox should both work.

Allows you to collapse and expand comments in a Hacker News thread

Reddits more comments button orders the comments weirdly, this will change it to use whatever your default is

Auto-load more comments. Click "Auto Load Comments" and more comments autoloads. Click "Stop" to stop loading. Toggle comments by clicking the Toggle Comments button.

Adds a button that opens and sorts comments by highest rating in a compact frame below the video. Shows actual most liked among all comments, unlike YouTube's current method. Jan 27/28 Update - AutoToggle On/Off added in 'User Script Commands' menu.

Adds a link to inbox to youtube's sidebar and also shows the number of unread comments.

На Хабрахабре, дает возможность увидеть текст комментария, на какой отвечает данный комментарий

Hide user comments from articles in news sites and other popular hangouts. This is a great tool for people who had enough of trolls, who want to avoid filthy commentary, and/or who waste too much time reading comments when they have better things ...

Moves soundcloud comments posted before the start of the track back to the beginning of the track where they belong

Redirects Reddit comments pages to location of article. This is useful when using Google Reader.

zeigt vollautomatisch alle kommentare und zitate an die vorher benutzerunfreundlich durch html/css/javascript versteckt bzw verdeckt sind

Removes the avatars from Youtube comments, resulting in less clutter.

Комментарии с поддержкой веток для каждого аниме и манги на MAL-е

Odkrywa zaminusowane komentarze w newsach i artykułach na pclab.pl

Downvote comments made by users in your blacklist

Removes the user comments sidebar on crunchyroll.com video pages. No more annoying commentary!

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

На Хабрахабре подсвечивает комментарии автора топика

Flip the "negative" and "positive" colors of an Ars Technica comment score

Adds comment quicktag buttons on every WordPress.com blog or blogs using the comments feature from the jetpack plugin.

Shows how many new reviews, comments, installs and fans your scripts have got since you last checked

Marks Hacker News comments read/unread.

hides comments in soundcloud player

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

On ALL websites, attempts to hide comments in embedded SoundCloud players.

Fixed the problem (bug?), that the reply button on youtube comments didn't open the area to write the reply from around 2012-07-12 to 2012-07-25.

Adds a working submit comment button to entries in the new default commenting system.