Valiant Galaxy Associates has created two major titles set within a fully developed history and universe.
They have also created a third smaller game set in the old west.
Please note that in order to purchase any of the Valiant Galaxy titles, you will need to create an account with Guidedog Games, which handles their purchases and ordering.
Also note that an internet connection is required to play.
These are offline versions of the manuals for all three games.
Please note that any links in these documents are unlikely to work, so you should only use them to read up on the games.