TweetRails is a client app which allows you to view Twitter as a news ticker on your Mac. Tweet links and user icons can be clicked to open the landing page if you hold down the modifier key you set. You can also click on the hashtag to stream the search results. You can select the modifier key from the command, option, shift, and control keys. You can switch accounts and search keywords at Preference. In addition, it is possible to change the view height, stream speed, and view position.
