Resident Evil 1.5, the most interesting, cancelled RE game ever. Capcom developed the game until it was about half way away of being finished.

Then Capcom cancelled the game due to it actually being too much like RE1. Therefore the fans called this cancelled game: "RE1.5"

There is a big site dedicated to this cancelled game. Be sure to check BioFlames. It gives you all the available information about RE1.5.