Anyone have any free options that actually have open invitations or that I can check out right now? The ones I have seen reported on end up being paid options.
Orion is free if you are trying to use the iPad as an HDMI monitor though in a pinch. I‘ve already used it a few times to connect it to an RPi that was unresponsive over a network I was working on
This is what their website says about the paid upgrade:
If you want to support the app, get Orion Pro: It packs AI upscaling, CRT emulation for retro games, and image adjustments (and whatever else we cook up). It's a one-time upgrade for $5. It unlocks everything. No subscriptions.
Today we're launching Orion: a small, fun app that helps you use your iPad as an external HDMI display for any camera, video game console, or even VHS.