Here is a list of crackers I found at my local natural food store that I found to be minimally processed and not highly adulterated: 
 
Here are some additional brands listed in the Wise Traditions shopping guide:
 
Always read the ingredient list before purchasing a product to make sure it meets your standards and needs.

“The earth is the LORD’s and the fulness thereof, the world and those who dwell therein; for he has founded it upon the seas, and established it upon the rivers”

 
– Psalms 24:1-2