I've worked on a few; three of my own that never went far (team members disappeared, I ran out of ideas, etc. I'm currently working on). I'm currently working on TPD's community hack, Pokemon Crestcave, and I was going to start a Hoenn anime remake. I'm a decent scripter, not a good mapper, and I can insert sprites, icons, but I do have a few friends who are very good mappers.