*Twittersearch
http://www.search.twitter.com

*GeoFollow - Geo (location based) twitter user search. (Add youself to the directory by sending @geofollow YOUR CITY, YOUR STATE YOUR ZIP #tag1 #tag2 #tag3. EG: @geofollow Walnut Creek, CA 94596 #directory #geek #people
http://geofollow.com

*Twazzup - Twazzup organizes search results so you can quickly turn the buzz on twitter into useful information. Search results include related keywords and hashtags, trendmakers along with popular tweets, twittpics and links.
http://www.twazzup.com

*Twifish - Extends twitter search and also searches for synonym words and phrases in twitter.
http://www.twifish.com/


*Wimme NEW – Find out what giveaways, contests, coupons, discounts, freebies and more are being tweeted right now by twitter users.
http://tweeplepages.com

*Tweeple Pages – A user powered directory of Twitter users organized by their interests.
http://tweeplepages.com

*IcroPlaza – Tribal Search, search the hot links shared on twitter and discover the trending topics.
http://microplaza.com

*Tweetzi - Twitter Search & Trends - A search service for finding and teasing out useful info from the 'Twittersphere'.
http://tweetzi.com


*Allyve .com - Only available in German. Create your personalized startpage and combine it with lots of other personalized widgets like myspace, facebook and other stuff from across the web to your page.
http://www.faroo.com

*FreeSearch - Find your friends on the web. Simply "follow" freesearch, tweet "@freesearch pete cashmore" or any other name, then wait a minute for the results!
http://wikiworldbook.com/twitter-freesearch/


*Green Tweets - Tracks tweets about green & environmental topics based on semantic natural language analysis rather than keyword
http://www.ecovian.com/green-tweets


*Navgle.com - Mashup of Twitter Search with Google Search Services to display search results as Universal Search results clustered by source type (Twitter, Web, News, Blog, Q&A, Encyclopedia, etc.)
http://twitter.oneriot.com

*TweetJobSearch - Search jobs posted on Twitter
http://www.tweetjobsearch.com

*TweetFind.com - Twitter Directory to Find Twitter Accounts and Add Your Twitter for FREE.
http://www.tweetfind.com

*Tweet on the Street - A Twitter-based rumor mill. Search for the latest buzz on technology, celebrities, politics, sports, and more.
http://tweetonthestreet.com/

*Tweet Scan - Search public Twitter posts in real-time from the page or using Firefox's search box. Find replies, track keywords, and sign up for daily/weekly email alerts.
http://davidsterry.com/tweetscan

*Terraminds micro search - Search entire public timeline in realtime, fast & responsive! New: Twitter search API
http://www.twellow.com

*TwiST -- Twitter Search Tool, an easy-to-use interface to Twitter Search
http://www.pcs-works.com/twitter.php

*TwitterTroll.com - Real-time Twitter search engine. Search through 1000s of indexed tweets everyday and find new friends.
http://www.twittertroll.com


*Twitterment beta Combines Twitter apps with a search engine and graphing tools
http://twitterment.umbc.edu

*TwitterJobSearch - The first semantic search engine for twitter. Finds all the jobs posted on twitter.
http://TwitterJobSearch.com

*TwitterSearch -- Full text searching for the recent Twitter zeitgeist, complete with toy dude-heads. A must! Also maps posts via Twittermap!
http://twittersearch.com

*Top News Trends - Top News Trends combines google trends data with twitter search.
http://topnewstrends.com/

*Summize Twitter Search - Realtime twitter search with language restriction and threading built right in. Free API included.
http://summize.com/

*Twubble -- Recommends new people to follow based upon your existing follows
http://www.crazybob.org/twubble/

*WhoShouldiFollow? -- Recommends interesting people to follow based on your network, and supports searching for a location and adjusting for popularity.
http://whoshouldifollow.com

*Intwition - Tracks what people are linking to and discussing on Twitter. Let's you lookup and find tweets about any site. Provides an RSS feed to track tweets about any site as well.
http://intwition.com

*TweetBeep.com - Twitter Email Alerts - Like Google alerts, but for Twitter! Save keyword searches and link/domain searches and be alerted by email when someone on Twitter mentions it! Free service, by @mdjensen
http://tweetbeep.com

*Tweetag - Browse the twittosphere with nested tagclouds and never miss any raising trend related to your favorite topics
http://tweetag.com


*FutureTweets - a free service that lets you schedule your Twitter messages. Send it at a specific time in the future or send a reoccuring Tweet daily, weekly, monthly or yearly! Handy if you're in need of an alibi.
http://futuretweets.com


*TwiSpot.com – TwiSpot is a Topic-Based Social Exploration Tool based on Twitter. Stay updated and explore interesting new topics with the Hottest Tweets all in one spot.
http://twispot.com


*Twithelp.me - Help people in the Twitter community find answers to things they want to know about. Search Twithelp.me for topics, then reply direct to anyone who you can help. You can set up RSS feeds too to be alerted of future Twithelps. If you want help, just include #twithelp in a tweet. (...think of it as Yahoo Answers for Twitter.)
http://twithelp.me

*PopularTweets.com - Browse the current top 10 most popular tweets, re-tweets, friends and followers on Twitter right now.
http://www.populartweets.com

*TweepSearch - Search Twitter bios, currently over 1 million indexed. Also provides the ability to search the bios of only those people following you.
http://tweepsearch.com

*TweeterLookup – The easiest way to lookup mutiple Twitter usernames at once from a list of email addresses, without having to input the list into your webmail accounts.
http://tweeterlookup.com

*Android software tweets - Watch realtime tweets about Google Android phone(with database with older tweets)
http://ihaveandroid.com/twitter/

*BackTweets - Search for links on Twitter (even if they've been shortened)
http://backtweets.com

*TwitterPray - A real time snapshot of what people are praying about on Twitter and what people are requesting for prayer. Trending, history, and request tracking (among other features) are slated to be added in the coming weeks.
http://www.twitterpray.com

*Tweeple of India - A searchable directory of twitter users from India
http://tweeple.in

*tweetactive - Search tweets & get real time stream.
http://www.tweetactive.com


*TweetRSVP - Tweets that include a question or request for information are pulled and available on TweetRSVP in real-time, or through a searchable database or via email. Visitors can reply or RSVP to a tweet directly from the site through twitter.com or by copy and paste if using a desktop client
http://www.tweetrsvp.com

Free Twitter Downloads