Here are two.
The Jim Danforth-Steve Barakett KING
KONG. Here, Jim told to Barakett that his a big fan of the original. After searching down the rights, they decided make a film adaptation of the novelization by Delos W. Lovelace. Due to the lack of money for the rights, it never got made.
Universal attempted to remake the classic. This one based on the novelization of the film. It is called THE LEGEND OF KING
KONG. This version was more faithful to the original 1933, in terms of story-telling and special effects. The music in the film is basically Max Steiner's score. Susan Blanklee was said to Ann Darrow, Peter Faulk was Carl Denham and for Jack Dricoll, it was either Robert Redford or Nick Notle. Bob Burns was said to play the role of the title ape. Jim Danforth was said to provide the stop-motion animation for the Skull Island dinosaurs.
Unfortunately, due to legal despute, there were changes to the film.
*Denham was a greedy villain.
*The Venture was called The Panama Queen.
*The Stegosaurus was replaced by an Arsinotherium.
*The Bronotsaurus was replaced by a Parasaurolophus.
*The spiders in the pit were replaced by scorpions.
*The Tyranosaurus Rex was replaced by a Triceratops.
*The Elasmosaurus was replaced by a Giant Spider-like Centipede .
*The Elevated Train attack was replaced by a fight with a 1930's steam-shovel (a la DINOSAURUS).
*Denham gets killed by having
Kong fall on him when he falls off the Empire State Building.
*Kong gets tied up in a raft made by the gate he destroyed in order to get to New York (a la KING
KONG VS GODZILLA).
Sadly, the film never got made.

Thanks to Dino Delaurentiis remake, there was a fight over the right on the original. Dino won the fight and in June 1976, the gate for Universal's version was destroyed. All is left is a script written by Bo Goldman, concept art of the film's monsters by Jim Danforth, a storyboard of the movie, an article from the magazine MOVIE PEOPLE and test footage of Bob Burns in the monkey suit.
Now I don't know who made or designed the suit. I heard in one source that it was Rick Baker, but other sources said that Chris Mueller (MONSTER ON CAMPUS) or Jack Kevan (Disney's 20'000 LEAGUES UNDER THE SEA) designed it. If so, where did those other source came from apart from a thread on stopmotionanimation.com.
Now around the time there was Universal's remake vs. Paramount's remake in the 70's, Roger Corman attempted to remake it. But it did not get made.
Dino Dellaurentiis announced that there were going to be two sequels to his remake: THE BIONIC
KONG (an attempt to cash in the bionic craze such as THE SIX MILLION DOLLAR MAN and THE BIONIC WOMAN) and KING
KONG IN AFRICA. Both never got made (thank God) but the story line two this film where
Kong gets resurrected Frankenstein-style and ends up working for evil villains. Also in the script it says that
Kong would eat up Dwan.
Some of the basis to this film ended up in 1986's KING
KONG LIVES.
Dino was also toying around with SON OF
KONG. After the remake he wouldn't want to touch it. After KING
KONG LIVES, he decided to touch the idea, but he can't because the movie flopped, big time! Well this Dino's remake gives out the right example of the right project in the wrong hands.
Another remake of the original KK was in the 50's (circa 1952). There was said to be a Cinerama remake of the original called THE EIGHTH WONDER, but it never got made.
Scroll forward to the 1970's. Around the time of QUEEN
KONG, Mario Bava wanted to make his own King Kong-type project called BABY
KONG. The script, the poster and the storyboards were made. The special effects was ready. The film was said to be shot in Ponza. Bava's monster movie came to a screeching halt when Dino's remake came out.
Fast forward to the mid-1990's. Before Peter Jackson's remake, John Landis said he was going to remake the classic, but all was left was it's announcement.