Curious how big the extended twitter universe (twitterverse) is, I decided I’d do my own investigation and provide results I found as a list of tools. Basically, it’s BIG. Google returns ~69.3 million hits for “Twitter.” Below is what I found relevant in the cream. You’ll notice I skipped Mac/PC clients. There are lots of great clients that people use for platform specific updates (perhaps a future blog post worth).

Websites:

• FriendFeed: Leverages Twitter Feed
• Quotably: Leverages Twitter Feed
• Twitter: The original site that started it all. Unfortunately it’s been highly unreliable over the last few weeks.
• Twitter Digest
• Twitter Mobile: Twitter’s official mobile website.

Spotting Trends (Techcrunch tweeted an even better one than these but I can’t for the life of me find it):

• PicoBuzz
• TweetVolume
• Twends
• Twitscoop
• TwitterBuzz: Tracks URL usage on Twitter (lots-o-TinyURL here)
• Twitt(url)y: Realtime tracking of “hot” URL’s

Tracking, Leaderboard, Ranking and Visualization:

• 5K Twitter Browser
• Tweeterboard
• Tweetmeme
• TweetWheel
• Twerp Scan: Users spewing SPAM
• Twist
• Twistori
• TwitDir
• Twitstat
• Twitter Blacklist: Users spewing SPAM
• Twitter Quotient: Brutally honest!
• Twitter Spectrum
• Twitterholic
• Twitter Stats
• Twubble
• Visual Twitter
• Who Should I Folow?: Find new folks to follow on Twitter

Voice Tools:

• TwitterFone: Private Beta Only
• TwitterGram

iPhone Specific:

• Hahlo
• iTweet
• MobileTwitter
• PocketTweets
• Twinkle: Requires Jailbreak
• Twitter for iPhone

Web Browser Plugins (a very short list):

• TwitBin: Firefox
• TwitterBar: Firefox

Social Networking Sites:

• Grazr Twitter Reader: Facebook
• Twitter: Facebook
• Twitter SyncMySpace
• Twitter Box: Second Life

Mobile Applications:

• Fring
• Jargong
• jTwitter
• Mobio
• MoTwit: En espanol (Spanish)
• Slandr: WAP site
• Tiny Twitter
• Twibble
• TwitterBerry: BlackBerry client
• WidSets – Twitter: Java client

Desktop Apps (Adobe AIR):

• Snitter
• Spaz
• Tweetr
• Twhirl: “a twitter client” is understated. Definite must have

Search:

• Flaptor Twitter Search
• Hashtags
• Summize: Amazing results
• Terraminds
• TweetScan
• TwitterSearch

Photos & Images:

• Mobypicture
• TwitPic
• TwitterGram: FlickrToTwitter

Mashups/Geolocation:

• TrackThis: UPS/FedEx/DHL etc package tracking
• TwitterLocal
• TwitterVision
• TwitterPoster

Blogging Tools (a very short list):

• Twitter Feed
• Twitter Tools: WordPress Plugin
• TwitThis

News & Politics:

• Alltop
• Politweets
• TweetWire

Survey Tools:

• Poll Daddy
• StrawPoll
• Twitter Census
• Twitter Answers
• Tweetburner URL tracking

Special thanks to franticindustries, Mashable and all of the assorted the commenters for the initial inspiration for this list. Also see Twitter Fan Wiki for a comprehensive list of apps. There are some big ones missing I’m sure, so YMMV with that list as with this one over time. All links/sites were active as of May 27, 2008.

GPSed is a great new GPS tool for tracking your location via your GPS enabled BlackBerry. More importantly, it scratches an itch I’ve had lately of helping me to geo-tag my photos. Flickr and Picassa are supported so that covers the majority of photo sharing apps. A little freaky perhaps is the ability to track exactly where the phone was when it last checked in. I’ll be using this when snapping photos on assorted walks around Rochester, MN providing better information for everyone to use.

I read about it first at Berry Review. This is MUCH better than the FindMe application for Facebook which uses cell towers (as best as I was able to tell) instead of the built in GPS unit to triangulate location. I could see this having huge utility for tracking down friends when your at a large venue (like a sports arena) and trying to locate your friends – although the mobile site has varied degrees of detail from the very slick Google maps interface on the full blown website.