Lots! Keep in mind that a wheat allergy is different than a gluten allergy. Wheat allergies usually only affect wheat grain or grain mixes including wheat. Gluten allergies affect many more grains.

Safe (wheat-free, not gluten-free) grains: kamut, barley, rye.

Safe (gluten-free & wheat-free) grains: quinoa, rice, millet, buckwheat, amaranth, specifically grown & processed gluten-free oats, corn, chia (a seed), tapioca, potato, any bean-derived flour. Keep in mind that flour can be made from lots of different wheat-free sources. Safe grains are slightly more limited than your flour options. Be creative!

Here are some resources:
http://www.celiac.org/
http://www.wheat-free.org/wheat-free-flour.html

Amarath, Buckwheat, Corn, Millet, Quinoa, Rice, Teff and Wild Rice are some.

quinoa & rice