ZION is just Doom 4's weapon models ripped and put into vanilla doom's engine. D4D is the most complex and feature rich mod of the bunch. D4T is a fork made by D4D's original creator which focuses on more streamlined gameplay (as well as smartphone compatibility, there's even an exclusive difficulty for phones in there), it's no longer being updated though.

Oh right Death Foretold, thanks for reminding me.

But why in the entire Hell there are multiple Doom 4 mods? I mean what's the big difference between those 3?


Also MetaDoom counts a little considering there are stuff from Doom 4

There's D4D, D4T and ZION. I don't know of any others.

There's another Doom 4 mod but I forgot the name...

yep

Is this D4D?