Gwibber!

TweetDeck aims to evolve the existing functionality of Twitter by taking an abundance of information i.e twitter feeds, and breaking it down into more manageable bite sized pieces. From a poster's point of view, it supports shortening URLs by a couple of different services, posting and hosting images at different sites, and scheduling tweets to be posted even if you're offline.

Choqok - KDE Micro-Blogging ClientThe name comes from an ancient Persian word, means Sparrow!Currently supports Twitter.com and Identi.ca services.It currently features:

Alternion is a social hub and communication center that enables you to combine and manage all your social web and email in one place.

Corebird is a Twitter app with an interface reminiscent of Twitter’s official app for OS X

Linux Twitter client designed for multiple columns of multiple accounts.

Socialite is a revolutionary social application that keeps all your social networks in one convenient place!Socialite makes it easy to stay in touch with the social networks and services that matter to you.

Terminal-based Twitter Client with Streaming API support. Only supports Ruby 1.9 and later.

“mybucketz” is your social media unified. The application allows you to connect to Tumblr, Instagram, Twitter and/or your favorite RSS feeds, bringing all of your feeds into one central location. Not only does it provide a one-stop shop for these social networks, it allows you to group friends/followings across these networks into individual "buckets”. A bucket can be anything from one person you know, to a group such as family or co-workers, or even just a description like sports. The buckets you create, your connected social network feeds, or posts based on a keyword search can be displayed, which enables you to see and act upon a real time listing of posts coming from each service. »

Rainbow Stream is a smart and nice Twitter Client on Terminal.

"Tweet It!" is designed with every single Windows device in mind. From phone with touch screen to desktop PC with mouse and keyboard you'll have great expirience. And Continuum support for pleasant PC like Twitter browsing when you are away from it.

Oysttyer is a console text-based command-line Twitter client and Perl platform, fork of ttytter

Aeries is a powerful Twitter client exclusively for Windows. Aeries has been designed to make using Twitter easier than ever, all packaged together in a slickly designed app. Fall in love with Twitter again through the power of Aeries.

Fenice is a full-featured Twitter app for Windows designed to offer the best Twitter experience to every user (pro or casual ones).