450 individual items have been released for the PlayStation Vita (that we know about).

This view shows items grouped by publisher. Click on the title of the item to visit its landing page. Remember that certain games may not have been released as individual items, and if so, you won't see them on this view. To see all individual programs for the PlayStation Vita, switch to Thing View.

If you are looking for books, expansions or just a more visual representation of this data, you can generate a "wall" to your exact requirements.