Tweeten is described as 'is based on TweetDeck which means it offers a powerful, column-based interface that helps you keep track of everything that's happening on Twitter—without needing to hit the refresh button. Tweeten offers a clean and intutive experience'. There are three alternatives to Tweeten for a variety of platforms, including Mac, Online / Web-based, Windows, PortableApps.com and Shopify. The best alternative is TweetDeck, which is free. Other great apps like Tweeten are Tweetdeckr (Free, Open Source) and Fan Page Robot (Freemium).
Tweetdeckr is an open source TweetDeck replacement client. As of the 15th April 2016 Twitter is officially discontinuing Tweetdeck for Windows. Tweetdeckr aims to be a simple drop in replacement for the previous version.