“Nestri is an open-source, self-hosted Geforce Now alternative with Stadia’s social features.”

“Our goal is to develop a comprehensive self-hosted cloud gaming solution for your home server.”

https://github.com/nestrilabs/nestri

Maybe https://nestri.io/ is similar enough to what you’re looking for?

Sidenote: A similar app is https://squoosh.app/

https://metager.org/ is run by a German non-profit. Since late last year it’s pay to use because their advertising partner (Yahoo) cancelled their contract without warning. But it’s cheaper than Kagi. Also the non-profit is part of the project that’s building the European OpenWebIndex ( https://ows.eu/ ) that’s releasing this year.