It's just me or RetroArch developed the best FLOSS alternative to proprietary UI? You have a nice overlay, CRT shaders, bezels, some netplay function, customizable interface. All of this completely free and super fast.
Wouldn't be nice to also launch non-emulated games from here?
Did you ever find out? I was just trying some gaming via a retro console and it is pretty cool! Seems very promising, certainly people must be doing other stuff.
From an user "the only way to run non-retroarch programs within retroarch is via the Windowcast-Core, but all that really does is allow you to use shaders and overlays. it also adds some latency, so I wouldn't really recommend it anyway."