It's last minute, but today only, at IHOP, kids 12 and under can get a free Scary Face Pancake. Offer is limit one per child and is available for dine in only.
This one you will want to verify your local Applebee's is participating. On Sunday, Trick or Treaters (children 12 or under, in costume) can receive a free kids meal with the purchase of an adult meal. I can't find this on their website (they do mention their Veterans Day offer), but I know that they did it last year, have seen it in articles online and was told that my local Applebee's is participating.
If you or your family is planning to dress up as a Horrifying Processed Food Item, head to Chipotle on Halloween for a $2 Burritto, Bowl, Salad or order of Tacos. This seems a little more challenging then dressing as a Burritto, where they will accept it as long as you have foil on.
TGI Friday's has some Halloween weekend deals that start today at 5 pm and running through Sunday. You can find the details here. Today and Saturday, the offer is a free appetizer on Friday and Saturday (need to be in costume) and on Sunday, the kids in costume eat free with the purchase of an adult meal.
Chili's is also offering free kids meals on Halloween. You need to sign up for their E-mail Club to get the coupon. Plus, it looks like if you sign up, you can also get the free Chips and Queso coupon still.
I'm sure that there are other deals and offers out there...have you seen any? Share them in the comments so everyone can enjoy.