Offers may vary, so call before you go.
Applebee's - Monday nights, kids eat free with the purchase of an adult entree. (Additional kids meals are $1 each)
Denny's - From 4-10pm on select nights, kids under 10 get a free kids meal with the purchase of an adult entree.
Pizza Hut - kids 3 and under eat free from the lunch buffet.(Real Simple - October 2010 p 217)
Chili's is ALWAYS offering kids eat free coupons and deals. Check out their website.