Mac OS

-Twitter app for Mac users
-Customizable tweet pages, just modify the HTML and CSS
-Create themes
-Supports yfrog, Twitpic and img.ly
-Support for multiple twitter accounts
-Filter tweets based on keywords

-See and send tweets, replies, DM’s
-Mentions integrated into timeline
-Inline yfrog and twitpic viewing
-Reply chains
-Growl notifications
-Twitter Search

-Seamlessly handle multiple Twitter accounts
-Explore all of Twitter, from your own timeline and mentions, to the favorite tweets of your followers and friends
-Full persistence: more than just caching tweets, Tweetie 2 restores your entire UI if you quit or get a phone call
-Fantastic new offline mode. Read, tweet, favorite, follow, save to Instapaper and more even when you don’t have a connection. Your actions will be synced as soon as you go back online
-Full landscape support
-Live-filter your tweet stream

* Mac OS X client which supports twitter as well as other similar sites
* Facility for @Reply, DM, Retweet and Fav
* Group your twitter friends for easy viewing of tweets from interesting friends
* Twitter Search
* Filters
* Shorten links using tr.im
* Upload and Share images using pic.im
* View trends
* Thread view of conversations
* Supports multiple accounts
* Supports multiple columns
* iPhone app available

* Clean, concise UI with small desktop footprint
* Supports multiple Twitter accounts
* Auto refreshing at user defined intervals
* Replies and direct messages are displayed inline
* Number of unread tweets shown in the Dock
* Delete tweets from Twitter quickly and easily
* Auto show / hide when new tweets arrive
* Control over window layering and priority
* Single click access to user profile pages
* Switch between friend and public tweets easily
* Keyboard shortcuts for list navigation and more
* Control Twitterrific with AppleScript
* Audio notification for new tweets
* Hotkey to show / hide tweets