Alternative to GfxTablet with screen mirroring: Weylus

[H-M-H]

You can find the project here: https://github.com/H-M-H/Weylus
Some of the features included:

• screen mirroring
• pressure sensitivity
• proper multi touch support
• partial support for Windows and macOS

Disclaimer: I am the author of said project and I hope it is alright to promote it here. If not feel free to remove this issue @rfc2822 .