Pokemon Mundo Perdido (Lost World) is a slightly different Pokemon game, which is made from RPG Maker XP.
PokeScape is a hack of Pokemon FireRed which let you become a new Pokemon Champion of the whole world.
Pokemon Play As Version (Soon) is a hack of Pokemon Emerald. At this time, it is staying at the alpha phase and get ready to be shown up.
Pokemon Epitaph Pokemon Epitaph is a Pokemon fan game made using RPG Maker XP.
Pokemon Caelus will tell you the story of Finso Region. It is a hack made from Pokemon FireRed.