New maps, and other projects whose primary focus is new maps, belong here.
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Besides GZDoom, there's Chocolate Heretic, Crispy Heretic, International Heretic and DSDA-Doom by now, at least. That's not little. Anyway, without a proper scripting language, reproducing this compilation in any other port is technically impossible, so I'll have to bury the idea for now.
Problem with Choco and Crispy is that feature-wise they're barely a step above vanilla.
There's also Doomsday (which, fun fact, started as a Hexen port and actually got support for Heretic before it got it for Doom), Vavoom, DelphiDoom, and Doom Legacy.
Doomsday, Vavoom, and DelphiDoom all have either MAPINFO support or their own equivalent, as well as ways to define new actors. Vavoom compatibility might actually work out of the box because it supports many of ZDoom's stuff.
That said, it's just an FYI thing; I'm not requesting you to do any extra work.