The database that tried to be everything to everyone is being replaced by more specific tools. The Google Base API, launched in 2005, has been deprecated. In its place, Google suggests using its new Google Shopping Search API for finding products and Shopping Content API for merchants to add products. The new APIs will help Google focus on the most common uses of Google Base. However, the change means that developers will have to update code and that some non-shopping applications will be left without a replacement.
Revel Systems API makes it possible to run a cash register, a restaurant and a mobile point-of-sale system with an iPad as the center of the user interface. Check out what Revel has to say about the API on their website.