Having been available as a beta for users for a while now SBSH has made their Calendar Pro app available for all. The SBSH Calendar Pro app is a more robust, feature rich calendar compared to what is included with your BlackBerry out of the box.
Advanced features such as colored time slots, built in task manager functions as well as multiple viewing options make calendar pro a great alternative if you need something a little more advanced then what RIM offers in the BlackBerry OS. SBSH Calendar Pro is a little pricey in my opinion but that said I'm not much of a calendar user. Others may find a great value in the $14.95 price point and a free trial is available in case you are on the fence. All devices OS 4.5+ are supported here.