Just posting a list is no fun, guys. You should talk about why the games you're talking about are great.
Starsiege: Tribes and Tribes 2 are what games like Halo and Team Fortress 2 dream of being. They've got better vehicles than Halo, better classes than TF2, and are, in fact, superior in every single way except maybe graphics to every other tactical FPS ever released. (Tribes: Vengeance does not exist. It never happened. Shush)
Also, Total Annihilation. Make sure you add in the 5k unit cap mod. Massive swarms of everything, laying waste to your enemies! Muahaha! (I haven't actually played SupCom, but I'm pretty sure my computer wouldn't be able to handle 5k units with today's graphics).