Benjamin,
Web-Grognards has some interesting variant material for NNN. (A game designed partially to spoof the fact that in the past, the only wargames that sold were about "NATO, Nukes and Nazis".)
NNN OstFront OOB:
http://web.archive.org/web/200010021.../wargames.html
New NNN Scenario: Total War, 2005
https://home.comcast.net/~dlamb123/nnn2005.pdf
(Includes detailed political analysis on the outbreak of the war and the birth of a Warsaw Pact... under the Nazis.)
Tony