[MayeulC]

Chromecast is completely closed-source, I'd argue against buying into that ecosystem.

Nymphcast [1] is an alternative, but wouldn't be compatible with existing clients, since the protocol is different.

Miraclecast [2] is an implementation of miracast/wi-fi display that runs on Linux. There is also a myriad of alternatives: vnc, raspicast, etc.

Leapcast [3] used to be an implementation of what you want (while using chrome as a black box).

There are some implementations of airplay servers.

And lastly, a lot of media players implement some way of playing on one another (vlc, kodi, jellyfin, plex).

Funnily, you might just be interested in UPNP and DLNA. Support for these is quite robust, but it tends to disappear on newer devices (to the benefit of proprietary solutions like chromecast and airplay).

[1]: http://nyanko.ws/product_nymphcast.php

[2]: https://github.com/albfan/miraclecast

[3]: https://github.com/dz0ny/leapcast

[mastazi]

Thank you good list, and yeah I get that it's a closed source system but wouldn't it be cool if the FOSS community was able to reverse engineer it?

Thanks I'll look into the alternatives you linked

[MayeulC]

Even if it succeeded, it would be yet another cat-and-mouse game with Google, for little benefit. Of course anyone is free to work on whatever they want, and I might use it if a solution existed.

Nymphcast and Kodi work relatively well as a substitute, but aren't integrated in google's products like youtube (you can still use "share to" usually).