Enjoy Life Foods      Since this company prides itself on it's avoidance of major allergens, these products not only do not contain gluten, but also are dairy-free, peanut-free, corn-free,  tree nut-free, egg-free, shellfish-free, fish-free, sulfite-free, sesame-free and casein-free.  They recently introduced a flax-based cereal that makes a great trail mix or a healthier crisp rice square.

ENER-G Foods-  Famous not only for gluten-free items but also for low-protein selections (for that rare nephrotic syndrome patient we sometimes get..)  Warning:  Items are not particularly tasty, but can provide a quick functional fix.  I've had folks take their own bread to Wendy's.  It sometimes makes the difference between going along and staying home.  Socialization is important, too.