Couple titles I recognize:
Age of Wonders II: totally deserving of being on the list.
Rise of Nations: I played a bit of the fantasy version, Rise of Nations: Rise of Legends, and I thought it was pretty slick.
Battle for Wesnoth: I never got into this one, but I have heard good things. It's got really nice race differentiation to the point that playing the Necromancer with an army of undead is a very different game.
XCOM, Homeworld, Men of War, I played a bit of. I got stuck in Homeworld, inadvertently put myself in an unwinnable situation (the "computer virus takes over the frigates" level), but I enjoyed the time I did spend. XCOM I don't think I ever played the "good" one. Men of War I highly recommend just for the physics. There is nothing quite like firing a shell through a building, hitting a tank, having the shell bounce off and
kill another tank.
Transport Tycoon:
What else should I be playing if I like this: Cities in Motion
Oh god, avoid Cities in Motion. Its broken beyond playable. You'll have a bus stop at the corner to pick up riders, and the traffic will back up behind it, all the way around the block, and
prevent the bus from moving. They hot-fixed this to make other vehicles despawn after 3 minutes of not moving (which works out to be like a week of game time). As you gain income based on actually picking up riders, but pay expenses based on game-time, this quickly makes an otherwise profitable route a debt spiral. CiM2 may have fixed it, but I never looked to find out.