No specific info about version 2.5. Please visit the main page of Tweetbot for Twitter on Mac Informer.
Echofon is an easy to use, super-fast Twitter app for the iPhone and iPod Touch.
Provides a column-based interface for your Twitter account.
BirdDrop app allows you to view Mobile Twitter on your Mac.
Piyo is an open source Twitter client for Mac OS X.
Twitter DJ is the latest brainwave from Richie Hawtin.