There is an Ubuntu website that has exactly that purpose. It's called Ubuntu Apps Directory. Just visit the Ubuntu Apps Directory website, and type the name of the app you want more information about in the search box next to where it says Search for an app. Then you'll get a fairly complete description of the app and also usually one or more screenshots. The screenshots start off small-sized, you can click on a screenshot to enlarge it to fullscreen.
There is an Ubuntu website that has exactly that purpose. It's called Ubuntu Apps Directory. Just visit the Ubuntu Apps Directory website, and type the name of the app you want more information about in the search box next to where it says Search for an app. Then you'll get a fairly complete description of the app and also usually one or more screenshots. The screenshots start off small-sized, you can click on a screenshot to enlarge it to fullscreen.
You could download the source and read the README file inside.