GedStar for

From GHCS Software:

GedStar from GHCS Software is the premier solution for having your genealogy data with you at all times -- right in the palm of your hand! Whether you are in a library, on a research trip, or just at a family gathering, all of your most important facts are just a few taps away.

GedStar works closely with your PC-based genealogy program, and is fully compatible with any program that can export data in the standard "GEDCOM" file format. This includes all known free and commercial products that are currently on the market. What's more, the new GedStar-Plus version can directly import data from certain popular genealogy programs.

The number of people that you can have in your database is virtually unlimited, as GedStar works the same for a few hundred or many thousands of individuals. You can store your data in multiple independent databases, and can store databases on insertable memory cards.