Brabblr – With Brabblr, you can post to all your micro blogging services including Twitter, Pownce, Jaiku, Tumblr, Jabber, Frazr, and more.
Autopostr – This service lets your friends in Twitter know when you post a new picture on Flickr.
EmailTwitter – With this service, you can send tweets to Twitter from your cellphone without incurring SMS charges.
GroupTweet – Allows you to post private message to a group of Twitter friends.
Hashtags – You can add tags to your Twitter posts with this service.
HelloTxt – This service enables you to update Twitter, a host of other micro blogging sites, and social networking sites with one click.
LinkBunch – Need to share more than one link in a tweet? LinkBunch puts together all the links and provides you one link that you can share on Twitter. As you might have understood, this can be used not just with Twitter, but also with emails, IMs, SMS, etc.
LiveTwitting – Helps you cover a conference live on Twitter. Similar to liveblogging, only cooler.
MicroRevie – Post reviews on twitter accs and this service will turn them into microformats.
Mobypicture – A service to post to your blog and micro-blogging sites like Twitter through your mobile phone.
OutTwit – A tool for Outlook that will send the latest tweets from your friends as incoming email messages.
SecretTweet – Post to Twitter anonymously. If you really need to.
SnapTweet – Allows you to post your Flickr pictures to Twitter.
Snitter – an Adobe AIR based desktop client for Twitter compatible with Mac and Windows. The Linux version is in testing.
Twhirl – Twhirl is a popular desktop client based on Adobe AIR. It has a lot of impressive features including multiple Twitter accounts, connect to Friendfeed, post image to Twitpic, post to Pownce and Jaiku simultaneously, and search using Tweetscan.
TweetCube – This service allows you to post files on Twitter. Files that can be shared include .zip, .rar, .pdf, .jpg, .png, .gif, .mp3 and .txt.
Tweetr– an AIR based Twitter client for MAC and PC. You can use this to send files upto 100MB.
Twibler – posts your ebay listings to Twitter automatically.
Twideeo – You can post videos to Twitter using this service that lets you upload the vid to their site and then generates a link to your video.
Twit+ – You can tweet pictures, videos, and files using this service publicly or privately among your friends on Twitter.
Twitxr – Another neat way to post a picture on Twitter, Facebook, or Picassa.
TweetChannel – You can add TweetChannel as your friend in Twitter to help you channel your various posts.
TweetLater – An useful service to schedule your Twitter posts for the future.
Twitpic – Share pictures on Twitter using Twitpic.
Twitsay – You can tweet an audio recording to Twitter using this new and popular service.
Twits Like Me – You can use this service to find people on Twitter who share your interests.
TwitterCal – This service allows you to post events from your Google calendar to your Twitter accounts.
Twitter Feed – This tool allows you to send your blog atom or RSS feed to Twitter.
TwitterGram – Post an mp3 on Twitter using this service.
Twitteroo – This is another popular desktop client for Twitter.
TwitterIM – Using this tool, you can tweet from Windows Live Messenger and ICQ.
Twitterlights – This tool allows you to highlight snippets of text from any webpage and send it to twitter. The url of the page also gets converted into a tinyurl and gets included in your tweet.
Twitter Reply – With this tool, you can send your Twitter updates on a secret email address, or through Windows Live Messenger or ICQ.
Twittershare – This desktop/web application also allows you to post pictures on Twitter. Works on Mac as well.
VisualTwitter – Allow you to post pictures on Twitter.
TopTweet – This site provides you updates from the top Twitter personalities. Yes, it took us a lot of tries to take a screenshot without Scoble in it.
TweetWire – TweetWire grabs the freshest links posted on Twitter and displays them Yahoo News page style.
Twitter100 – Just like in your personal start pages, this tool will allocate a box to each of the people you follow on a single page and display their latest tweets.
Twitterator – Twitterator enables you to follow a group of people at one go.
Twitter Digest – This tool allows you to subscribe to a message stream from a Twitter user of a group of users on the web or through an atom feed.
Alpha Twitter – This site provides you with the top links on Twitter.
Summize – A Twitter search engine, lately shaping into the leader of this space. You can run a RSS feed on your query too and filter tweets by language.
Flaptor Twitter Search – A simple Twitter search engine. You can get an RSS feed out of your search query as well.
Terraminds – Another search tool for Twitter.
Tweet Scan – This is a search engine for Twitter indexing all the public messages on Twitter.
Twits Like Me – This tool helps you find people on Twitter who share your interests.
Twubble – This also helps find people who share your interests on Twitter. It brings our profiles who your current friends are already following.
TwitBuzz – TwitBuzz is a service that follows the links, messages,and users on Twitter and displays them nicely on its site Digg-style.
TweetBeep – Just like Google Alerts, this service will send you an alert whenever your set keyword is mentioned on Twitter or when somebody link to your site.
TwitGraph – This service provides graphs of your Twitter usage – tweets by day, top 5 words, top 5 links, and top replies.
GeoTwitterous – Enter a Twitter ID and this tool will display from where the people that particular person is following are in a global map.
My Tweet Map – This tool will show you the latest tweets from your friends on a map.
Quotably – With Quotably, you can check out any Twitter user’s conversations in a thread conversation style making it easier to follow. Extremely useful.
Sitevolume – Just like Alexa, this site will allow to see how many time a particular term has been used on Twitter, Digg, MySpace, YouTube, and Flickr. You can add in multiple terms and see bar graphs comparing the terms.
Twetterboard – An analytics service that provides information about popular Twitter users and popular links.
Tweetburner – Tweetburner gives you click stats for the links you posted in Twitter.
Twittermeter – You can use Twittermeter to see how frequently a word has been used on Twitter. You can also compare two or more words.
Twemes – Twemes follows Twitter public messages with particular tags to build a meme around a topic.
TweetStats – You can grab your Twitter stats including your tweet timeline, tweet per month, and tweet per hour.
TweetVolume – With this, you can check how many time a particular word appear on Twitter. You can compare upto five words and see the results in bar graphs.
TwitterLocal – This tool allows you to generate an RSS Feed of a filtered list of tweets from a certain area.
Tweetmeme – Displays popular topics on Twitter and those people talking about that topic.
Twist – This provides trends of what people are saying on Twitter just like Google Trends does for internet search words.
Twittermap – This tool displays the most recent public updates in the last 12 hours.
Twittermeter – Allows you to compare any keywords used on Twitter on through a graphical interface.
Twitt(url)y – This service tracks the most linked to urls on Twitter and display them Digg-style.
Wiiizzz – This service lists the audio tracks that have been listed to and shared on Twitter.
iPhone and other mobile phone clients （iPhone应用和客户端）
Pocket Tweets – A web based Twitter client for the iphone.
Twittai – A Java-based Twitter client compatible with more than 200 kinds of mobile phones.
ceTwit – Twitter client for Windows Mobile. Not as cool as the iPhone versions, but then again, what is?
Twapper – Send updates from your 30boxes calendar to your mobile phone using Twitter.
TwitterFone – You can update Twitter from your mobile phone using this service.
Qik – Stream videos from your mobile phone to Twitter using Qik. Surprisingly, it works really well – try it out.
Bkkeepr – With this service, you can track the books you are reading on Twitter.
FoodFeed – FoodFeed is a micro blogging site that you can use to post about your food habits through Twitter.
Hahlo – if you are not satisfied with your Twitter interface, you can check out Hahlo to manage your Twitter account. It gives you a separate profile page and the rest of the Twitter features in a new look.
LoudTwitter – This tool posts your Twitter posts on your blog. Hey, isn’t Twitter supposed to be some kind of a blog, too? Now I’m confused.
My Tweeple – Manage your friends and followers in Twitter on a single web page.
Politweets – You can check out your presidential candidate’s popularity on Twitter here.
Post Like a Pirate – This tool allow you to convert your post into pirate-speak before posting it to Twitter. I, however, don’t need it, because I already speak like a pirate. Yarr!
Quitter – Quitter will help you how to use Twitter to quit smoking. Bonus points for cool name.
Roll.The.Dice – You can use this service to do all the silly things on Twitter like roll a dice, flip a coin, deal cards, or generate a random number.
StrawPoll – Sends out polls on Twitter that you can participate on. As they say, you can never have too many polls.
TrackThis – This is an useful service to get updates of your shipment using Twitter. It supports FedEx, UPS, USPS and DHL tracking codes.
Twee60 – You can tweet your Xbox live status with Twee60 automatically.
Twit2twit – Just like Facebook Wall to Wall, this service enables you to view any two Twitter users conversation via replies.
Twitimonials – This service allows you to praise your friends in a special way on Twitter.
TwitResponse – Set up your Twitter posts for the future.
TwittEarth – This is a 3D model of the earth displaying the latest updates on Twitter across the globe. You can download the tool as a screensaver.
Twitterfeed – Posts your blog posts automatically to Twitter.
TwitterMeThis – When you follow TwitterMeThis, it will send you a question randomly. If you are the first to answer that question, then you get $5.
TwitterSpy – TwitterSpy provides you a Google map on its site. when you hover your mouse above certain locations on that map, you get to see the latest public posts from that area. Strangely addicting.
Tweet140 – This service tracks your Twitter messages and rates them according to how many characters you messages are. The closer to 140 characters they are, the higher you score.
Tweetclouds – Create a word cloud from a public Twitter stream using this service.
Tweetgift – Remember Facebook where you can poke, throw a sheep, or hug a friend? Tweetgift enables you to do the same on Twitter.
Twaction – Another service that lets you do Facebook-style pokes and slaps at friends.
Twistori – Based on Summize, this service collects Twitter messages with words such as love, hate, think, believe, wish, and feel and displays them on its site with automatic updates.
Tweet Clouds – Make a tag cloud from your Twitter posts.
Tweetpeek – You can create a group Twitter feed with Tweetpeek.
TweetWheel – You can find out which of your Twitter friends know each other with this service.
Twitku – Mashup of Twitter, Jaiku, and Pownce public timelines. You can also post from its interface.
Twitpoll – You can participate on polls using Twitter through Twitpoll.
Tweetshots – this service allows you to take your Twitter posts to Tumblr, embed in websites, or send over email.
TwitterAnswers – TwitterAnswers combines Twitter and Mosio, so that you can send questions over Twitter and have them answered by other people.
Twitter Census – You can create surveys on Twitter using this service.
Twitter Comic Book – Enter your Twitter name, and this tool will create a comic strip for you based on your latest tweets, using Flickr pictures.
TwittEarth – A 3D globe of Twitter public timelines.
Twitter Karma – This tool fetches your Twitter friends and followers and displays them for you, letting you paginate through them in a nicer way than you would on Twitter.
TwitterNotes – You can create notes on TwitterNotes using Twitter and tagging your notes.
TwitterPoster – This site generates a mosaic of user icons of those with a large number of followers on Twitter.
TwitterSnooze – If you have friends on Twitter who are updating every 10 seconds and are irritating the hell out of you, you can simply now snooze them away using this tool.
TwitterSpectrum – Based on Summize, this tool show you the associated words of two pair of words or names in a nice spectrum layout.
Twittertale – Twittertale records all the swearing you do on Twitter and lists them down on its site. It also lists the top swearers and the top 5 naughty words.
Xpenser – Record your expenses using Twitter. You can also use other mediums like email, SMS, IM, voice, etc.
Who Should I follow – Find interesting people to follow on Twitter using this tool.
Twitter Live Updater – This one updates your Twitter pages without refreshing the webpage on your browser.
Friendfeed Filters – Allows you to create filters and groups of friends on Friendfeed.
Friendfeed Twitter Client – This create a ‘Also send this comment as an @reply twitter’ option on the Friendfeed comment box.
Friendfeed Tiny URL Resolver – Creates an inline preview of the Twitter tinyurls displayed on your Friendfeed page. Click the question mark displayed at the end of each tinyurl on the Friendfeed page.
Twitzer – This addon allows you to write more than 140 letters in your Twitter posts. The extra letters will be saved offsite and link to it will be placed on Twitter.
TwittyTunes – You can post the songs that you are listening to currently on Twitter using this handy plugin. Don’t be surprised if people start unfollowing you.
Twitterbook – Tweet your favorite sites when you bookmark them on your browser using this addon. Don’t use it if you’re a heavy bookmarker, or else you’ll annoy the hell out of everyone.
Twitterline – Displays your friends’ public timelines on your browser toolbar.
Twitkit – A Twitter client for your Firefox sidebar.
Twitturl – This addon allows you to tweet the current url you are on on your browser.
Twixxer – Twixxer is a Firefox addon that allows you to post Twitter updates.
Twitterratio – This tool allows you to compare the ratio of the number of people you follow to those who follow you. The higher the ratio, the more Twitter heat you have.
Twitscoop – This tool pulls out the words most used in Twitter every minute and displays on its site.
Twitter Movie Reviews – You can review movies on Twitter using this service. It contributes to a handy list of graded movies, great when you need to quickly find something good at the video store.