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Onlive (deceased).

Microsoft (xCloud). Free until it’s stable.

Nvidia (GeForce NOW). Free until it’s stable.

Sony (PlayStation Now).

.. Seriously dude where’ve you been?

And you can add others like Shadow, or you could roll your own using Parsec or Moonlight + a cloud provider like Paperspace or AWS (or even Google cloud).

What is important in case of Shadow, GeForce Now and roll you own, that you buy a PC game that you can access on any PC, not just using a single service (like Stadia, or xCloud).

https://en.wikipedia.org/wiki/OnLive

>The OnLive Game Service was launched in the United States on June 17, 2010. The service was launched in the United Kingdom on September 22, 2011.

https://en.wikipedia.org/wiki/PlayStation_Now

"PlayStation Now (PS Now) is a cloud gaming subscription service developed by Sony Interactive Entertainment."