UberSocial!

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.

Tweetbot is a full-featured Twitter client with a lot of personality. Whether it’s the meticulously-crafted interface, sounds & animation, or features like multiple timelines & smart gestures, there’s a lot to love about Tweetbot.

Tired of seeing ads and promotions in your timeline, being disrupted by tweets from bots and people you don't like, or just want a pure Twitter experience back like the good old days? Try Twidere for Twitter!

PromoRepublic is a Social Media Content Builder and Posting Tool. It provides users with more than 100 000 ideas, templates, and visuals for stunning Facebook, Instagram, Twitter and LinkedIn posts.

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:

Gwibber is an open source microblogging client for GNOME developed with Python and GTK. It brings the most popular social networking web services to your desktop and gives you the ability to control how you communicate.

Sprout Social is a social media management platform used by leading companies across the globe to increase the efficiency of their social marketing efforts, community building and customer support via social channels such as Facebook and Twitter.

Echofon: social apps for Twitter and Facebook.

Twitterrific is a fun application that lets you both read and publish posts or "tweets" to the Twitter community website. The applications user interface is clean, concise and designed to take up a minimum of real estate on your Mac or iOS device.

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.

Janetter is a Twitter client application.Faster, smarter, and more powerful.The best Twitter client on the net!

Falcon is a powerful widget that brings a full Twitter client to your homescreen !

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

Twicca is a Twitter client for Android that is simply awesome.