The Wonderland Board

I found this neat little program called ShaderGlass that allows you to add all kinds of different adjustable retro-themed shaders on top of pretty much any program!
I just wanted to post this here because it looks really nice with the Wonderland games (see above picture).
You'll definitely want to check out the CRT section.

The only downsides are that it doesn't seem to be able to capture games running in fullscreen windows, and on Windows 10 there's a yellow border around whatever is being captured (removable in Windows 11).

There was another program I tried called Reshade, but I had difficulties getting it to hook onto anything.