Pokemon Crystal Shards is a Pokemon Hack that is based on Pokemon Emerald ROM. This hack is for those who love Pokemon Gold/Silver/Crystal Version on Game Boy Color.
Pokemon Crono is an awesome Hack of Pokemon Emerald. If you want a new game with the new Region, it is a good choice.
Pokemon Flora Sky is an excellent ROM Hack of Pokemon Emerald with a lot of new features including 2 versions: Main Version and Complement Dex Version.