I've considered quail...for meat and eggs...small space, quick maturity.
That's exactly why I chose them. 8 weeks to maturity, and some start culling males at 5-6 weeks, and you get an egg a day. Cull the layers at 8 months and you've had 6 months of eggs and still have a very nice meat bird. Not as tender as at 8 weeks, but much better than a spent hen. I could easily house 50 quail in my chicken coop that holds 8 chickens, and I'd get the chicken run back. I really like my chickens, but I live in a downtown semi in a city that doesn't allow them, so I'm having a hard time justifying them.
I've also started down the meat rabbit path, but that's going to be brutal in 10 weeks.