GBAtemp community member @DevL0rd just made public the release version of his homebrew app SkyNX that allows users to stream PC games to their Nintendo Switch console. With a homebrew-enabled Switch, SkyNX lets you stream PC games, complete with audio, to your Switch at 60 FPS. It also supports up to 4 Joy-Cons and some touch controls on the Switch.
Below are some of the key features:
Stream PC games with audio to switch at 60 FPS
Handles up to 4 JoyCon pairs. (4 Players at once)
Optionally disable video to use the JoyCons as remotes on PC
Optionally disable audio.
Optionally swap A and B AND X and Y.
Handles basic touch input.
Handles right click. (Touch with 1 finger, tap with the second)
Handles scrolling. (Your standard 2 finger scroll.)
Downloads and instructions on how to install SkyNX can be found in the link below, but keep in mind that you are performing these at your own risk. If you have any questions or comments, feel free to join in the discussion in the GBAtemp thread below.
UPDATE:
There's now a how-to video about setting up SkyNX on your compatible Switch, and it gives you a look at the software in action: