The easiest way to view the available apps is from IDEA. There is also a direct link from the https://www.casewareanalytics.com/ web site, at the very top they have a link to the marketplace.
From within IDEA you would go to the SmartAnalzyer tab and select Marketplace.
This will bring up the Marketplace interface.
From the top of the page you can select All Apps to see a list of all the available apps.
You can then find out more info on the apps and purchase them if you wish.