I built a SuperDisplay alternative for MacOS to use my Samsung tablet as a secondary display — feels just like plugging in a monitor now. I also put together an extremely specialised video streaming host and client to get better quality and stability than Discord's screenshare, alongside an Android TV app to cast this video stream. (It has a bunch of features like media control passthrough and display/window selection on the receiver side; things no existing application implements because of how intrusive it'd be for the sender.)