Pocketwit

Pocketwit is a free open-source Twitter client for Windows Mobile devices (PocketPCs and SmartPhones.) with number of functions. The application is open-source under MIT license and built with .NET 2.0 compact platform.

The application has number of notable features like updating your location (requires GPS), grouping your friends, multiple accounts supporting, sharing images using different photo sharing services (TwitPix, Yfrog…), taking and uploading a photo from your mobile camera, and long tweeting using shorttext.com. It supports identi.ca accounts as well.

Flitter

Flitter is an awesome Windows screensaver for Twitter and Flickr. It’s free and open-source app built with .NET framework. The screensaver is highly configurable, you can watch the last tweets or pics from the public timeline of Twitter or Flickr, or watch specific users. You can also watch your Twitter and Flickr network.

To install the screen saver, you need to right click on the Flitter.scr file and choose “Install” from the menu.

TinyTwitter

TinyTwitter is a simple Twitter client for any Java enabled phones (like Nokia, BlackBerry, Windows Mobile phones, Pocket PCs, SmartPhones, Motorola, LG, and others). Tiny Twitter doesn’t have much features like other mobile Twitter client. It’s minimal client and free as well. Check all features here.

What The Trend?

What The Trend? is a web service that tells why a certain trend is popular right now. Very smart service and brings you the latest tweets, news , and photos of the trend. For example, there’s a current trend “Microsoft”, and What The Trend? explaination of the trend is that Gizmodo released an exclusive report of the Courier, Microsoft’s “secret” tablet:

MySpace Sync

MySpace has lunched a new service recently to synchronize MySpace users statuses with Twitter and vise versa. Just visit the MySpace Sync page and choose Twitter from the list. It will direct you to Twitter for OAuth Twitter authentication. After allowing MySpace to use your twitter account, you are done!

Now when tweet or update your status on MySpace, you will get two way synchronization. Pretty cool and simple. MySpace Sync is currently beta and supports only Twitter. But other services will be added soon. Hope the next would be Facebook synchronization

GoodbyeBuddy

GoodbyeBuddy is a Twitter bot account like FollowerMonitor service. It sends you direct messages when someone unfollows you. Differ than FollowerMonitor which sends only replies (not direct messages). You only need to follow GoodbyeBuddy to use the service. A much better alternative for Qwitter service.

Twikini

Twikini is written in native C++ programming language which makes it a fast app. It supports uploading pictures using TwitPic and different URL shortening services. One cool feature is integration with Windows Media Player by tweeting the song you are listening to plus the artist name.

Bad that Twikini is free for 14 days only as tria, or you can buy it for $4.95 only.

Flyar

Flyar is an interactive Twitter screensaver based on Augmented Reality and gesture interaction technologies using your webcam for capturing motions. The application is so funny and lets feel the real noise of Twitter

It’s difficult to explain this visualization project .. just watch!

Archivist

Archivist is a Twitter desktop app for Windows that aims to archive tweets for later use or search. The app is simple, just write a word and Archivist will search for its latest tweets and keeps updating every 5 minutes.

The problem this Twitter app is trying to solve is that Twitter search can’t show more than 1500 tweets of a certain word search, also, many Twitter users I’ve faced missing old tweets. Archivist comes to store the tweets on your desktop as XML files, or even export them to Microsoft Excel.

One big con of Archivist is it can only archive the tweets of a word search, not the tweets of your time line and your friends. Also the Archivist search criteria is very week offering only search for words, not users, not in a time or other options as what Twitter search offers.

Choqok

Choqok is a micro-blogging client for Linux K Desktop Environment (KDE). It’s free and open source application supporting Twitter and Identi.ca.

The name “choqok” comes from an ancient Persian word which means Sparrow!

ChoqoK has many features like multiple accounts, supporting right to left (RTL) languages, TwitPic integration, KWallet integration, ability to notify user about new statuses text with KNotification or Libnotify, expanding shortened URLs using Untiny service, and many others.

Echofon (Formerly TwitterFon)

Echofon (formerly TwitterFon) is a simple and easy to use iPhone Twitter app with many features.

There’s a free version comes with TwitPic integration, video uploading, shortened URLs previewing and other features.

The pro version (for $4.99) comes with much extra features like supporting multiple Twitter account, push notifications , sync Echofon iPhone with Echofon Firefox plugin (TwitterFox), ad free, bit.ly and Flickr integration, and others. Check all features of both versions here.