Advent Rising is a third-person, intergalactic action/adventure epic, akin to a fast-paced action movie where the player is swept up in an ever-evolving series of sequences and events.
Day of Defeat is a World War II multiplayer first-person action game that pits players in Axis vs. Allies battles in Western Europe at the height of the war in 1944.
A remake/update of the original Day of Defeat (a WWII shooter originally designed by the MOD community of Half-Life), running on the Half-Life 2 Source engine.