GeForce NOW has been available for a few months, long enough for your free trial to run out. If you dropped NOW after that, it might be time to give it another look. The service is getting an infusion of fresh games from publishing juggernaut Square Enix. There will be five games coming to NOW soon, starting today with Tomb Raider (the 2013 one).
Tomb Raider and subsequent Square releases will all be added to the free tier of games. So once you have a $7.99 subscription, you can play these games at no additional cost as much as you want. Tomb Raider will be followed by Sleeping Dogs, Lara Croft and the Guardian of Light, Quantum Conundrum, and Murdered: Soul Suspect. You'll need reasonably speedy internet to play at the highest quality, though.
GeForce NOW works on SHIELD devices and comes with a three month trial if you've never subscribed before. NVIDIA says it's working to get more games and publishers on board with GeForce NOW, but it's focusing on rolling out the Square games for the time being.