LiquidSky gives you a full Windows gaming PC in the cloud that you can access from any device. Games like League of Legends and Fallout 4 run on their highest settings with ultra low latency. With LiquidSky you can install any program or game to your SkyComputer as long as it does not break our term and conditions rules.
OnLive was a cloud gaming service which allowed you to stream a closed catalog of mostly indie games to low end devices. The service had no support for online/multiplayer games. Many reviews claim that games were delivered with low graphics quality and a great deal of latency. Onlive was shut down a few years ago and is no longer operating.
Similar to OnLive, NVIDIA GeForce Now offers a closed catalog of mostly indie PC games. GeForce Now also only works on NVIDIA Shield devices.