Userscripts.org

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.

Enhance twitter.com by adding a search box (with search suggestions) to search tweets or current events/happenings right from your twitter home page.

Adds a character counter to the comment field, clicks the 'reply on Twitter' and has an interface for sending Tweets

twitter https link rewrite and redirect script

Minify recognizes any URLs in what you are typing and automatically shortens them using the is.gd service.

Convert direct links to Twitter tweets to use Quotably instead

Expands snipr, tinyurl.com, is.gd, zz.gd and bit.ly urls on Twitter and FriendFeed to show you where they're pointing.

Makes the character counter count bytes instead of Unicode characters, since that's what Twitter uses at the back end

Update by hitting Ctrl-Enter from the text box

Utility to send Direct Message to multiple users at once on Twitter.

Reclaims the F5 key from Twitter, making it refresh the current page

adds links to hashtags.org, twemes.com or search.twitter.com to tweets on twitter.com

Replaces the 'more' button on twitter.com with 'MOAR!'

replace video links to NicoVideo thumbnail.

kills confirmation dialog on deleting DM.

Display images from links directly on twitter.com or other web-based twitter clients. In Chinese: 在 twitter 及其客户端网站上显示图片缩略图。

reloads twitter home page after updated your status.

Retweet Interesting Tweets on Twitter

Adds a search field to the Twitter interface

Undo the text input lock on Twitter

Keep the elapsed time indicators current

Marks Twitter tab with the number of unread messages