How to show off a GeForce 780 without spending money?

battlefield 4 beta maybe?

Wait for Crysis 3 sale on Origin, it often goes around 6$. I can't think of a free game worthy of Gtx780 in terms of graphics really.

Edit: ^ Yes, Bf4 beta should be good!

Planetside 2 should be a good showcase and is F2P iirc.

Yeah Planetside 2 its a good idea, you can also check the Nvidia website, it have a lot of nice 3D showcases and Tech demos.

Have you looked into the "A New Dawn" demo?

Only 1 GTX780? Cheapskates.....

I'm going to buy a new graphics card soon just to have a flawless Battlefield 4 experience, so I would suggest downloading the beta!

Why spend a lot of money on a card that you will not use to its' fullest potential ?

Warframe?

PLanetside 2 might be your best bet, Warframe is also heavy, sort of. This is for free to play games.

The Nvidia real time face demo is pretty cool, for non-gamers, too.

3D Mark was ok.

The nvidia demos might also be something.

Unigine Heaven Engine and Unigine Valley

Passmark

Just built a new rig with the 780, an Asus 144hz 24 inch monitor, an i7-4770k processor, and a Asus Z87-Pro mobo - Crysis 3, Tomb Raider, and some other AAA titles look really, really good on it.

EDIT: I know you said you weren't interested in AAA titles, but you really should see at least one running once.

Get the BF4 Beta, or the Unigine Benchmarks, or Planetside 2, Blacklight Retribution.

Those are the most graphic intensive F2P games i can think of right now.

You could see if any AAA games have demos, then you get the best of both worlds - a way of showing off your pc, and a version of the game designed to be showed off

Blacklight Retrebution.