Continuing my review of post-apocalyptic comics with Marvel's contributions to the genre:
What's the Apocalypse? Not entirely clear, but evidently a coup by Roxxon Oil followed by war.
Who are the heroes? Luther Manning aka Deathlok, a cyborg.
Where can you read it? Deathlok the Demolisher: The Complete Collection.
What's the Apocalypse? An alien invasion (from Mars) in 2001.
Who are the heroes? Killraven and his companions, freedom fighters against Martian rule.
Where can you read it? Essential Killraven volume 1.
Planet of the Apes
What's the Apocalypse? A nuclear war.
Who are the heroes? Time-displayed astronauts, a human named Jason and an ape named Alexander.
Where can you read it? back issues only. Or here.