Looking for a privacy friendly chromecast alternative

Title says it all, I'm looking for something as user-friendly as a chromecast but not made by a company like google. I'm familiar with linux and if some open source software exists that can do this I would love it.

Ideally it would be able to stream things like Netflix and Disney+ using a smartphone. Would be great if it can also play local files from an external hard drive, but I have a raspberry pi with Kodi for that so that's not a hard requirement by any means.

Price range: preferably under €/$/£100 but for something truly excellent it can be a bit more than that.