On a similar note, you can use your old phone as a Streamdeck alternative using TouchPortal [1]. It's not free, but it won't cost you much and it works surprisingly well.
This seems to be a free, open source software that does something similar: https://stream-pi.com/
According to the video I'm currently listening to, it only has a Linux client currently, but has Windows and Linux hosts.
Edit: I've played with this a bit with a surface pro running Linux as a client and Windows as host and the thing holding it back at this moment is lack of plugins. I use Stream Deck to manage my gaming sessions (Steam, Discord, Voicemod soundboard and voices, occassionally OBS, game launches, etc.) and as-is for my purposes this can really only manage OBS and things that have configured hotkeys.
According to the video I'm currently listening to, it only has a Linux client currently, but has Windows and Linux hosts.
Edit: I've played with this a bit with a surface pro running Linux as a client and Windows as host and the thing holding it back at this moment is lack of plugins. I use Stream Deck to manage my gaming sessions (Steam, Discord, Voicemod soundboard and voices, occassionally OBS, game launches, etc.) and as-is for my purposes this can really only manage OBS and things that have configured hotkeys.