Blood Bowl: Chaos Edition is based upon the tabletop game Blood Bowl (3rd edition). BoardGameGeek.com link:

Small World 2 is based upon the board game Small World. BoardGameGeek.com link:

Elder Sign: Omens is based upon the tabletop game Elder Sign. BoardGameGeek.com link:

Hive is based upon the tabletop game of the same name. BoardGameGeek.com link:

Ascension is based upon the CCG Ascension: Deckbuilding Game. BoardGameGeek.com link:

Sentinels of the Multiverse is based upon the CCG of the same name. BoardGameGeek.com link:

BattleLore:Command is based upon the tabletop game Battlelore (2nd Edition). BoardGameGeek.com link:

Civilization IV has been turned into a tabletop game by Fantasy Flight Games.

The Witcher Adventure Game is a digital version of a tabletop game based upon The Witcher video games. (Double twist!) BoardGameGeek.com link:

The Resident Evil series has been turned into a deck building game by Bandai. BoardGameGeek.com link: