Twitter client with Real Time Notifications?

Is there a Twitter client (or just a utility) that pushes real time Twitter feed / mentions notifications? By real time, I mean notified as soon as the tweet is posted, like what MetroTwit does in Windows.

Hotot's had support for user streams(aka real-time updates) since quite some time. If the Chrome Extension isn't not what you're looking at, you can install the native client.

It is available in Ubuntu Software Center, click here to install it

Try Polly, I think it's brilliant. Don't know whether it's real time but it's quick enough for me to not notice.

The launchpad site is here Polly.

Or this is the PPA: ppa:conscioususer/polly-unstable

Just to note: It's currently in Alpha development stage but I haven't noticed any bugs as of yet.

The Twitter Notifier extension for Chrome shows real time HTML5 desktop notifications.

TweetDeck provides real time notifications too, but I transferred to Hotot because TweetDeck was too heavy an app for me and requires too much of a bandwidth with my poor internet connection.