I love apocalyptic films but good ones are hard to find.
Knowing (2009) Nicolas Cage film about the end of the world
Last Night (1998) a film about the last night of the world.
28 Days Later (2002) Not the end but a great zombie film
Night of the living Dead (1990) Not literally the end but a good zombie film
Those just popped into my head. Any recommendations?
Terminator, Mad Max, Planet of the Apes and Matrix series *cough*
"Miracle Mile" is cheesy and cheap but not altogether terrible. "The Book of Eli" is good, even if I can't help but to view it as Fallout 3: The Movie
Then you have your weather/comet/asteroid impact movies like "Armageddon," a.k.a. The Movie with the Most Countdowns in Modern Cinema a.k.a. the Movie with the Dumbest Premise Ever (shatter an asteroid the size of Texas with a couple of centrally buried nukes? HAHAHAHAHAHAHA), "Deep Impact," "2012" and ... what's the one with all of the ice and Dennis Quaid? Eh, I forget and I'm too fucking lazy to Google it. "Day After Tomorrow," I think.
There's also "I Am Legend," "12 Monkeys," "The Road" (which I've not seen), Kevin Costner's "Waterworld" and
"Dirtworld" "The Postman," "Solar Babies," that awful movie with the dude who replaced James Caan in the TV adaptation of "Alien Nation" (Robot Jox, I think? It is a real piece of shit) ... the list is endless.
A better question is, what are plausible or semi-realistic apocalypse movies? "Deep Impact" probably comes closest. Like I said, "Armageddon" was not only one countdown after another, it was just fucking stupid. If an asteroid as wide as Texas was going to hit Earth, unless we had a Star Destroyer handy, we'd be pretty much fucked barring all but THE earliest detection (like in Jovian space). The movie made it out like Bruce Willis and company could drill a couple of holes into the rock, drop a nuke or two down them and BAM!, that'd be that. Drilling down into the rock would dramatically increase a nuke's efficacy, but scientists have already figured out that it'd take a 1 megaton detonation in the very middle of a kilometer-wide asteroid to violently shatter it (depending on the rock's composition). A 10 km-wide rock would require 1,000 megatons of centrally-buried nukes to blow into small pieces.
For reference's sake, the world's entire nuclear arsenal is on the order of a few gigatons, perhaps 10 gigatons (10,000 megatons). Most of those devices are HUGE. Getting all of them into orbit and plucking them down a hole would be probably the greatest achievement of mankind ...
But even THEN, it'd fall woefully short. Texas is over 1,200 kilometers wide. We'd lack the yield to shatter the thing into pieces by over a million to ten million times
The best thing to do would be to perform precise surface detonations on such a large object to try and alter its course. Nail something in a sweet spot at just the right time and it might zoom straight past Earth (or, preferably, hit another body so it won't ever circle back around and threaten us again).