Pokemon Luola is a good hacking project of Pokemon FireRed that has been started a long time ago.
Jupiter’s Shadow: a monster-collecting game : From two of his favorite games which are related to the monsters capturing, the author has created Jupiter’s Shadow for the PC platform with the support from the RPG Maker XP tool.
PokeScape is a hack of Pokemon FireRed which let you become a new Pokemon Champion of the whole world.
Pokemon Recollections : From the template of RPG Maker XP and Pokemon Essentials, Pokemon Recollections has been created.
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.