My favorite are
#1 FREDDY VS GHOSTBUSTERS
As you can see by the title this FF two movie franchises that were created in 1984 will buts heads for 1984 supremecy.
Synopsis
A person called Neil Anderson has been having very extreme nightmares since he got his new mattress. In these nightmares hes being stalked by a person with dirty brown hat and red and green striped sweater and a razor tipped glove in his right hand. But help comes in the form of two of his out-of-town friends Eugene, and Ed Spengler, nephew of former Ghostbuster great Egon Spengler. They've arrived just in time as paranormal activity around the city of DENVER start increasing and Neil joins them to BUST these ghosts. But they eventually find out about FREDDY and fight him.
http://www.braxtanfilm.com/fvgb.htmlThis site also has two alternate endings, trailers, blooper reel, script, and behind the scenes featurete.
#2 LEGENDS
When a writer called Michael gets writer block his sister Laurie gets him and 5 of their friends to go out on a camping trip. But then the the lines between reality and fiction blend and unleashes two of the notorious movie serial killers. Now these 7 people are trapped in what they considered a movie.
http://www.godboutentertainment.com/films/legends/legendsfilm.htmThe site has the film, trailer, and a behind the scenes featurete. At the original site of this film it has two versions of the film the onlt difference between them is that a few scenes were taken out(these scenes had the second killer in them). A music video, and a little movie that had the killers battle one another.
#3 THE NIGHTMARE ENDS ON HALLOWEEN
CONCEPT
After his death at the end of FVJ FREDDY is in LIMBO and finds Michael Myers there and he tries to get Michael to wake up and kill JASON but his plan backfires and he ends up battling him. At the end of the movies it has a cameo of JASON and two other icons of horror.
http://www.michalak.org/fh/fanfilms/NightmareEnds_dloads.html