Pretty much all video games are liberal or have strong liberal biases because they're made in a totalitarian liberal system by products of that system. Here, I'll list some;
Command & Conquer
Mass Effect
Baldurs Gate
Age of Empires
Warcraft 1-3
Tomb Raider
Metal Gear (series)
Deus Ex
The Witcher series
Assassin's Creed (entire series)
Fallout series
Half-life
Ace Combat (series)
Total War
Paradox Game Studios Map painters (all of them, EXTREMELY liberal in fact)
Wolfenstein
X-Com