The Dark Times is a Star Wars Battlefront II mod with a heavy single-player focus. It adds many new features to the game, including (but not limited to!) wave modes, randomized units, heroes, and skyboxes, and AI hero support. Its sequel, Rising Son, adds more of the above as well as several new maps and scripted missions.
I loved the campaign in this mod. The class system was greatly improved by having different special classes on different maps. My only problem with this mod is when you have to escort the Mon Cal engineers on the Mon Cal level, they will kill each other if you have FF on.
My Absolute Favorite part of this mod is the Mon Calamari Space map, I have oodles of fun on that map. I recommend playing it with a Flight sim joy stick (I use the Logitech Attack3).