Another FPS game I found. The whole game is based on the fact that your character has skis and a jet-pack, used to build up speed riding around on hills.

It is mostly made for Capture the Flag, which is really fun because of the skis and jet-packs. This is the most popular and in my opinion the best game type, however there are some others. The game is difficult at first, especially if your new to fps shooters on the comp, but the style of play relies more on jumping around and gaining speed than skill at shooting people.

You can download on Hi-Rez Studio's website, or on steam if you have it.

Steam: http://store.steampowered.com/app/17080/
Hi-Rez Studio: https://account.hirezstudios.com/tribesascend/

When I first played this game, it lagged so hard, even with my graphical settings tweaked all the way down. So I quit the game and that was the last time I played it.
I just started on Planetside 2, however, and I kinda see that both games have quite the similarity. Both are F2P high-quality First-Person-Shooters, both are set in a sci-fi environment, both even looks a bit similar, and both lags a lot. Yes, both of them lags a ton even with graphics set to lowest. So I found a few ways to make everything on Planetside 2 lag less, and I think this should work on Tribes: Ascend, too!
I'll be trying this game out the second time, maybe tweak everything, including the shadows to make everything lag less. THEN maybe I'll start playing this on a regular basis along with Planetside 2, Minecraft, TF2, Airmech and other stuff... idk.

Hopefully you can get a better computer sometime :P

I also got Planetside 2, but I wasn't a fan of it. I didn't like the whole constant game on one giant server, and I really didn't understand it. I see how you think they're similar, but there are two giants things that separate them. Planetside 2 is, like a said, a constant game, where this Tribes Ascend match-by-match. Also the skiing and capture the flag basis makes Tribes Ascend very unique, and IMO much better.