Good Games that don't require high Computer Specs?

I got a Asus T100 Transformer and got it originally for school and just want to try to get some games from Steam that don't require a lot of Ram or a great graphics card for when i'm travelling. Eventually ill uprgrade to a Razer Blade but what are some good games that don't require high specs. Also how well will these games run if the specs are turned all the way low.
-Portal and Portal 2
-Dota 2
-TF2
-Garrys Mod
-Minecraft
-Day Z

So yeah, good games that don't require high specs and how well will the games above run?

P.S The processor on my PC is Intel Atom, have 2GB of Ram, and 32 Bit operating sysyem.

Guest

TF2, Garrys Mod, Minecraft and the portals should run well. Not sure about Day Z though
Other good games:

-Smite
-CS: GO
-Rust

Louis

TF2 should be okay, Minecraft could be either way, G mod should be okay.
Dayz I doubt, it is poorly optimised.

Star wars battlefront and battlefront 2 are good games which don't need decent specs.

Adrian