• Listento.fm - Share music & video on Twitter. You can either search or post a direct MP3/Youtube/IMEEM link. Our tool will generate a media page (with your page design) for you to share with your twitter fans. @listentofm
  • BigTweet - BigTweet installs as a bookmarklet and allows you to post to Twitter from any web page. Choose a classic 140 character update, or a 240 character tweet. Insert special Unicode characters and shorten URLs with the Bit.ly API right from the bookmarklet window. Automatically capture the current page title, URL and any highlighted text. No registration is required - only Twitter login credentials are needed.
  • Book Price Check - a simple way to check book prices via reply and direct message to your mobile device.
  • XLTweet.com - For eXtra Long Tweets (tweets over 140 characters) Super easy-to-use. Includes rich text editor for formatting fonts (styles, sizes, colors) and bullet lists (similar to this PBWiki editor).
  • twAnswers.net - ask any question and you will receive an automatic answer via twitter. other twitter users can also answer your question
  • Twerbose - Quickly post larger tweets to twitter.  Up to 1,400 characters.  Then followers can comment on your massive tweets.
  • twittinesis.com - Copy tweets from your twitter page to your blog. Supports more blogs than other services that perform this service.
  • Twoxit.Com - Embed a twitter form into your website for your visitors to update their twitter profile for free. Choose from many template styles & sizes.
  • plzRT.me - adds a compact retweet link to your tweets, enabling and encouraging users to retweet you with a click and comment. Retweets/comments are displayed in a thread.
  • a2f.me - create a short URL, update your twitter status with personalized message, requires username/password. You may also send a text message to a mobile phone, as well as update facebook (Alpha Release)
  • twAitter (Now in Alpha) - A full Twitter web client with a comprehensive scheduling platform.  Schedule tweets to send at anytime(recurring included).  Manage your scheduled messages with an Outlook style Twitter Calendar. (www.twAitter.com)
  • twt.fm - tweet some music!  type in an artist, track, and your twitter username. twt.fm will then generate a track page for you using your twitter page design and you’ll be able to tweet it to your followers. @twtfm
  • Twickly.Com - Make quick tweets to your twitter profile using predefined common message templates then allows you to post stright to Twitter FREE! Helping you save time & effort.
  • twe2.com - Twe2 sends your Twitter alerts via SMS technology directly to your mobile device - Free. It works in Europe, Canada, Australia, US and others.
  • Twitter2Mail - Send your @replies via email (or possibly even SMS). Get your emails in nicely formatted batches or for every @reply! From @twit2apps!
  • TweetLater.com - Schedule future-date tweets for as many Twitter accounts as you want.
  • Annotated links - pack a bunch of links as well as your post-it note into one shrot URL and share it via Twitter
  • mail2.im - mail2.im relays messages. Get your inbound twitter notifications routed to whichever IM or phone you’re currently using. Get other messages to you routed to you as twitter direct messages.  Twitter specific instructions on getting started here
  • Protected notes - publish password protected tweets, share password protected files via Twitter
  • Secure notes - publish one time readable tweets. Secure notes in the public status line.
  • Twash - Twash is a database that cointains awesome tweets. You can add a twash, or vote twashes to improve their ranking. Discover some cool tweets in twash!
  • Twonvert.Com - The new way to say more with your twitter update. No need to struggle to squeeze words into your twitter posts - twonvet converts / translates your tweets into shorthand language, slang, text message speak & common abbreviations then allows you to post stright to Twitter FREE! Helping you say more with less characters.
  • Tweetube - Easily share your favorite YouTube videos on Twitter. Allows discovery, tracking and comments among your followers.
  • 2tweet - 2tweet is a free service from 2pad to easily tweet photos and videos from email, just email your photos/videos to twitter@2pad.com - the first time you’ll receive an email with instructions to activate your account, then everything will be automatic.
  • PingVine - PingVine is a free service that takes an Atom or RSS feed from your blog, lifestream or favorite website and posts it to Twitter, Ping.fm, or Identica.
  • Posterous.com — Posterous lets you post multiple photos, video, music, all through email. Autopost to twitter via email. Best Mobile Startup Finalist, Crunchies 2008
  • Song.ly - Song.ly lets you share music on twitter.
  • Acamin.com - http://www.acamin.com - A convenient and ethical way of sharing/posting files on Twitter
  • Tweetworks - With groups and threaded discussions, Tweetworks makes tweeting more useful by tuning out the noise and letting you participate in the conversations that interest you most.
  • Tweetparty - Tweetparty lets you create and mange contact groups and send direct messages to them.
  • Tweet13 - Tweet13 lets you publish ROT3 obscured updates and add an optional decipher link.
  • Postica - Postica lets you create sticky note reminders via twitter.
  • Twitter Weather - Twitter Weather lets you publish daily weather updates to the twitter user of your choice!
  • Twittertise - Twittertise allows you to schedule in advance and track the clickthroughs on tweets. Ideal for advertisers looking to measure effectiveness.
  • twiggit - twiggit is an automated service that lets your friends on twitter know what articles you digg.
  • Mobypicture - Mobypicture lets you share postings to your Twitter, Flickr, Wordpress, Blogspot, Tumblr, Hyves and Jaiku accounts from your mobile phone, email or from the web, including pictures, text and soon video and audio!
  • Tweetly Updater - a Wordpress plugin that updates Twitter when you create or edit a blog entry, it uses the bit.ly service for short urls.
  • Joint Contact - Integrates online project management and Twitter. Allows users to send project related messages directly to Twitter. See printscreens at our blog or contact us.
  • theTwitterTagProject - Because Facebook shouldn’t be the only app with SUPER-POKE!
  • TrackThis - Track your FedEx, UPS, USPS and DHL packages using Twitter direct messages
  • SalesTwit - Contact management for Twitter. Load your electronic (gmail, yahoo!, outlook, mail) address book and get regular twits reminding you to contact folks. d msg back and leave notes about your contacts. {beta: use sign-up link at top and invite code: sttest}
  • Twitzer - Twitzer is a tool which lets you post text longer than 140 characters on Twitter. It can be used from within Twitter and no sign-ups or sign-ins required.
  • fitURL - fitURL creates short URLs just like tinyURL accept it fights spam by checking for spam URLs which makes it much more reliable!
  • twi8r - twi8r translates text message shorthand to English and vice versa and let’s you post immediately to twitter. No sign-ups/sign-ins required. Works on mobile browsers also. {beta site – new features added every week}
  • TwitPic - Share photos on twitter.
  • TwitOrg - Twitter for organizations. Create / Manage / Join organizations with TwitOrg.
  • TwitPlan - Plan tweets.
  • LinkBunch - Put several URLs into one bunch, which is a compact URL that you can use in your tweet. Kinda like TinyURL, but for multiple links.
  • QuoteURL - Build quotes from Twitter, create sets of individual updates and have them all in a single page that can be shared with your friends or embedded in your website. (video demo)
  • MessageDance - sign-up now - Send photos, videos, any file type from your email, YouTube, iPhone and Facebook to Twitter. You can create a blog post the same way with a tweet to Twitter as well. How Twitter integration works.
  • Tweet Scan - Get tweets emailed to you that match your keywords and phrases on a daily or weekly basis.
  • Twittermail.com - Send and recieve tweets via e-mail and has some other great features like tweeting in the future, and recieve replies updates in your mailbox!
  • MobiFeedLive.com Receive Keyword Based Email Alerts so you can see who is saying what about you… Also has Search, Link Metrics, and Trend Analysis…
  • EmailTwitter — free Mail-to-Twitter gateway, lets users post Twitter updates and retrieve Twitter timelines via a cellular phone or other e-mail enabled mobile device without incurring SMS fees.
  • Tweetahead Dashboard Widget - allows you to schedule tweets into the future (homepage)
  • John Doe - the anonymous twitter user :)
  • LoudTwitter - Daily email you tweets at your email address. This is the exact contrary of Twittermail.
  • RetweetMe - Get reminder tweets with an easy to use natural language for specifying the time of the reminder @retweetme in 15 minutes; update your twitter status. Follow RetweetMe
  • SnapTweet - Posts your latest Flickr photos to Twitter! Very simple.
  • ProjectLocker - Sends Twitter direct message updates when a change happens in your Subversion repository.
  • tweetshots - tweetshots enables you to take a twitter tweet to tumblr or embed in other pages/blogs. tweetshots are tweet screenshots, automated.
  • Twitter Answers with @TweetAnswers - Ask questions and get answers with Tweet Answers! It’s like Yahoo! Answers, but for Twitter. Simple to use: “@tweetanswers #topic Your question”. Follow @tweetanswers for new questions, or go to TweetAnswers.com. By @mdjensen
  • LiveTwitting - Use LiveTwitting for your next conference, event, or meeting instead of liveblogging. Simple commands to turn recording on and off, all through Twitter! Learn how to use livetwitting or check out LiveTwitting events. By @mdjensen
  • BiggerTwitter - A service similar to Twitzer which allows you to post longer messages, although works by placing a link in the Tweet.
  • PicPostr - A service designed to let you send photos from your phone to your twitter or identi.ca account. Email photos from your phone to PicPostr and have a shortened URL and description posted directly to your account.
  • Voolia Murls - A unique URL shortening service that converts several URLS into a single, short url with preview and other handy features.
  • SecretTweet - Post your secrets and private thoughts anonymously to Twitter. It’s like PostSecret for Twitter.
  • HappyTwitday - Celebrating all Twitter Birthdays! Checks all Twitter messages for Happy Birthday messages, and assigns the birthday to the @Twitterer. Multiple birthday wishes are tallied as well. Follow @HappyTwitday to get notified when one of your Twitter friends has a birthday through @reply messages! By @mdjensen
  • Tweetmarks.com - Twitter Bookmarks - Automatically save and categorize the links you tweet about, and automically add them to your del.icio.us account! By @mdjensen
  • Dadnab - Plans your trips on public transportation using text messaging (SMS). Optionally notify your Twitter followers of where you’re planning to go.
  • Unicode Symbol Map - Bookmarklet for quick access to unicode symbols ‘64.
  • gamerDNA - Automatically share your video gaming by connecting your gamerDNA.com account to Twitter. By @gamerDNA
  • Twilert - Twilert is a Twitter application that lets you receive regular email updates of tweets containing your brand, product, service, well any keyword you like really.
  • Twishlistter - Create a wishlist by sending messages to a Twitter user.
  • Twitter Toolbar - Toolbar for the Firefox browser. Quickly post updates, and check for replies.
  • Mr. MileStone - Notifies you when you have reached 100 followers. Repeats every 100th.
  • Twrivia - Tweets a daily trivia question.
  • theSUGGESTR - theSUGGESTR.com allows you to post your ratings of local restaurants and businesses directly to your Twitter account.
  • Plinky - Plinky makes it easy for you to create inspired content. Every day we provide a prompt (i.e. a question or challenge) and you answer. Easily shares your answers on Twitter. Follow @plinkyprompts to receive the daily prompt.
  • TweetCube - Allows sharing of files via Twitter, from MP3s to PDF, Images to Excel files. Just log in and Tweet.
  • VacaTweet - Let your followers know when you are out of town, or just send an @reply to them when they message you.
  • TweetMyJOBS - Job Posting and searching service for Twitter.
  • TwitPickr - Are you looking for an easy way to upload your twitpick images to flickr? Stop looking, twitpickr is all you need
  • RSSFriends - Creates a RSS Feed of your new followers or unfollowers.
  • Twittley - First Twitter Social bookmarking site.Submit cool news you find,and share it with other Twitter users
  • Impersonitter - allows you to update your Twitter status while letting you specify a “source.” (e.g. having “from TwitterBerry” at the bottom of your tweets– even if you don’t have a BlackBerry or the TwitterBerry app.)