Seeds you can plant directly in the ground
Vegetables you can transplant if you have seedlings
A note on where to get these things: Natureworks still has seeds, and always keeps a good stock of what can currently be planted. Seed catologs are also still mailing seeds to order. Natureworks is the only garden center I know of that gets fall vegetable seedlings, usually starting early/mid August into September, and they have a good variety. Seedlings for most fall crops are started in mid May-mid June, so you can get a jump on planning for next year.