Web Directory

» #hashtags
   Tracks the frequency that a hashtag is used on Twitter and provides details about the hashtag.
   http://hashtags.org

» CoTweet
   Helps teams manage one or more Twitter accounts by providing tweet assignments, notes, and on duty status.
   http://cotweet.com

» Commuter Feed
   Get traffic and transit updates from Twitter posts.
   http://www.commuterfeed.com/

» Featured Users
   An ad network of Twitter applications where Twitter users advertise their profile to gain followers.
   http://FeaturedUsers.com

» Follow Cost
   Follow cost measures how frequently people tweet.
   http://followcost.com

» Friend Or Follow
   Twitter followers management application that shows the user who they are following that is not following them back and vice versa.
   http://FriendOrFollow.com

» FutureTweets
   A free service that lets users schedule Twitter messages at a specific time in the future or send a recurring Tweet at daily, weekly, monthly or yearly intervals.
   http://futuretweets.com

» Just Tweet It
   Directory of users classified by interest and occupation. Also includes tools, services and latest news.
   http://justtweetit.com

» Mr. Tweet
   Recommends users to follow by comparing social graphs, weighing recommendations from other Twitter users, and other user commonalities.
   http://mrtweet.com

» OneForty
   Twitter outfitter with resources to track applications.
   http://oneforty.com

» PollDaddy Twitter Polls
   Enables the easy creation of hosted polls.
   http://twitter.polldaddy.com/

» SayTweet
   Create a mashup of pictures with Twitter messages. Upload a picture, tag Twitter users in the picture, then embed the dynamic badge on any web site or blog.
   http://saytweet.com

» The Shorty Awards
   Honors the world's top Twitterers for their ability to write great content with 140 characters or less.
   http://shortyawards.com/

» Trawler
   Allows for filtered searches on keywords, people, places, and dates.
   http://web101.de/

» Tweet Scan
   Real-time search engine for Twitter and identi.ca.
   http://www.tweetscan.com/

» TweetBeep
   Enables anyone to receive alerts by email whenever a specific word or phrase is tweeted on Twitter.
   http://tweetbeep.com/

» TweetLater
   Schedule tweets to be posted on Twitter at some point in the future.
   http://www.tweetlater.com

» Twellow
   A search directory of people by area of expertise, profession or other attribute listed in personal profiles on Twitter.
   http://www.twellow.com/

» Twibble
   Mobile and desktop client with geo-location api. [Nokia, Blackberry, Windows, MacOS, Linux]
   http://www.twibble.de/

» Twiddeo
   Offers the option to add video to a message.
   http://www.twiddeo.com/

» Twistori
   The first step in an ongoing social experiment based on Twitter. Provides a dynamic stream of Tweets that include words such as love, hate, think and believe.
   http://twistori.com

» TwitPic
   Share photos on Twitter.
   http://twitpic.com

» TwitStamp
   Enables users to place their current Twitter status anywhere in the form of an image. Statuses can be posted anywhere an image can such as blogs, forums and websites.
   http://twitstamp.com

» Twitalytics
   A blog focused on Twitter culture including links to resources and a running synopsis of popular topics.
   http://twitalytics.blogspot.com/

» Twitbacks
   Lets users create and upload their own Twitter backgrounds.
   http://www.twitbacks.com

» Twittad
   Provides an opportunity for Twitter users to display advertisements on their user profiles.
   http://twittad.com

» Twitter Moms
   An online community site for mothers who use Twitter.
   http://www.twittermoms.com/

» TwitterCounter
   Offers Twitter user statistics and historical follower count.
   http://twittercounter.com/

» Twitterfeed
   Offers to tweet the last posts published in a blog via the RSS feed.
   http://twitterfeed.com/

» Twittermap
   Provides users with the ability to update their locations on a Google Map and send a tweet with it.
   http://twittermap.tv/

» Twitterment
   A search engine for Twitter.
   http://twitterment.com/

» Twittervision
   A real-time geographic visualization of posts to Twitter.
   http://www.twittervision.com

» Twonvert
   Helps users translate their Twitter updates into abbreviated SMS shorthand. Makes it possible to say more within the 140 char limit. Updates are posted to Twitter for free.
   http://www.twonvert.com

» Twtbase
   Directory of Twitter applications.
   http://www.twtbase.com/

» Twubble
   A Twitter application that helps users to expand their friend list by searching friend's friends to find more people to follow.
   http://www.crazybob.org/twubble/

» WeFollow
   A tag based user generated Twitter directory.
   http://wefollow.com/

» Yfrog
   A service for sharing photos on Twitter.
   http://yfrog.com/