* TwitterFox: If you’re a Firefox user, and need an unobtrusive Twitter app to keep you abreast of news but not take up half your computer screen, then TwitterFox is for you. Simple if imperfect.
* Twitterific: Ideal for Mac and iPhone or iPod touch users, Twitterific works well on mobile devices, and has a small desktop footprint. Built in support for TwitPic is a nice touch.
* TweetDeck: Powerhouse Twitter app that makes it easy to break feeds into manageable chunks, and even categorise replies. Requires a computer running Adobe Air, but works on both PCs and Macs.
* Tweetie: Tweetie works really well on the iPhone and iPod touch, enabling users to handle multiple Twitter accounts through one interface, easily follow and unfollow people, and navigate @replies in the form of threaded conversations.
* Twibble: It’s not just iPhone users who can log in to Twitter on their phones – those who own Java-enabled smartphones, including Nokia, BlackBerry and Sony Ericsson, can get in on the action too. There’s built-in TwitPic support, too, and a desktop version is also available.
* TwitterBerry: Alternatively, CrackBerry addicts can turn to TwitterBerry, a streamlined, simple application that can be downloaded over the air to your phone. Does the basics well.
* SocialScope: This software, currently in invitation-only alpha testing, is another app aimed at BlackBerry users, and it offers a few more bells and whistles than TwitterBerry, including the ability to easily access and update your Facebook account, and near real-time notifications of @replies and direct messages.
* TwitterFon: This client, aimed at iPhone and iPod touch users, boasts a lovely, easy to follow interface, and the ability to search tweets by keyword, location of users, and even hot trends.
* TwitterFall: Brilliant website, founded by two British students no less, that provides a rolling, visual guides to the latest tweets. You can filter messages by hot search topics or custom terms, as well as view your own timeline. Invaluable for knowing what’s hot and what’s not in the Twitterverse.
* Mr Tweet: Knowing who to follow on Twitter can be tricky. Thankfully, help is at hand from Mr Tweet. Follow Mr Tweet on Twitter, and he will recommend people you should be following, help you uncover other networks and groups that may be relevant to your needs and interests, and even help you power-up your Twitter performance with some useful usage stats and handy pointers.
* TwitterSheep: This neat website will build a “tag cloud” from the biographical information of your Twitter followers. Essentially, this is a visual representation of the topics and conversations that most interest your followers. Perhaps somewhat tellingly, most of my followers seem to be interested in PR, with technology a close second. Hmm.
* #hashtags: “Hash tags” – that’s a word prefixed with the # symbol – are used by Twitterers to make it easier for people to follow key topics on Twitter. For instance, users who were tweeting about the heavy snowfall in the UK earlier this month added the “#uksnow” hash tag to their tweets, while those discussing the Mumbai terrorist attacks last year used “#mumbai”. This website provides an at-a-glance running ticker of popular hash tags, to help Twitter users keep up to speed with hot topics.
* Twitter Search: It’s impossible to keep up with all the conversations on Twitter, so using a search service like this one can be really useful. You can search by hash tag, or by keywords, and it supports Boolean queries. Helpfully, it also provides a running list of “trending topics”, as well as an advanced search facility.
* HootSuite: The self-styled “ultimate Twitter toolbox” is a fantastic resource. It allows you to manage multiple Twitter profiles, pre-schedule and automate your tweets to other services, such as RSS feeds, and even gives some useful stats to help you hone your Twitter performance.
* Twhirl: This smart desktop Twitter client uses the Adobe Air platform to embed a neat, unobtrusive window on your computer that enables you to keep up to speed with not only Twitter activity, but also your FriendFeed and Seesmic streams, among others. It automatically shortens long URLs and can cross-post tweets to other sites, such as Facebook and Ping.fm, should you so desire.
* Twitt (url) y: According to Hitwise, more than 10 per cent of downlinks from Twitter – that’s website addresses included in messages – go to news and media sites. Twitturly does a great job of tracking what stories and sites people are using Twitter to link to, be it photos, videos or blogs.
* Twistori: This strangely compelling website tracks tweets that contain the words love, hate, think, believe, feel or wish, and presents those messages in a constant, rolling, technicolour ticker, providing an intriguing insight into the emotions of the Twitterverse.
* TweetBeep: TweetBeep is a really neat tool that sends you an email alert every hour, giving you a breakdown of all @replies directed at you, as well as instances where your website, blog, company name, favourite hobby or band, and even customised keywords are mentioned in tweets. Ideal for online reputation management, and identifying new ways to get your message across on Twitter.
* HelloTwitFace: Windows Mobile users should give HelloTwitFace a try. It’s been optimised for devices running the Windows Mobile platform, and has a simple user interface and some nice features, including a “De-Scobleizer” tab (named after prolific Twitter user Robert Scoble) to easily filter out tweets from individual users.
* TwitScoop: This website provides a real-time visualisation of hot trending topics, as well as links to the most recent tweets that mention that keyword.

by:telegraph