Some of my favorites:
McDonald's asian chicken salad with grilled chicken (10 g fat)
Add 2.5 g fat for low-fat ginger sesame dressing.
McDonald's also has various SnackWraps with grilled chicken (8-10 g fat)
McDonald's for breakfast has the original Egg McMuffin (12 g fat)
For other McDonald's snacks, I like the Fruit and Yogurt Parfait (2 g fat) and the Apple Dippers with Caramel Sauce (0.5 g fat)
McDonald's for dessert has the Vanilla ice cream cone (3.5 g fat)
Del Taco's Chicken Taco Del Carbon (5 g fat) - good, but pretty small- definitely get more than 1! Also comes in steak.
Arby's Junior Roast Beef Sandwich (10 g fat) or Ham and Cheese Melt (5 g fat)
Jack In the Box has the Chicken fajita pita (10 g fat, 7 if you omit the cheese)
Wendy's sour cream and chives baked potato PLUS chili (10 g fat). Add a junior-size frosty (4 g fat)
KFC's Honey BBQ Chicken Snacker (only 3 g fat! One of my favorites! Only 99 cents where I live, and they're actually pretty sizeable)
Carl's Jr. has the Charbroiled BBQ Chicken Sandwich (4.5 g fat). A little plain, but good if you like BBQ sauce.
Taco Bell - anything on the "Fresco" menu - quite a few options!
Pretty much all fast food places have side salads now which are basically zero fat if you get fat-free dressing and skip the croutons.
If you ARE in the mood for splurging on something fried, I'd recommend Chick-Fil-A. They use peanut oil without trans fat, and their chicken is really good. They also have neat sides like fresh fruit cups.
A lot of fast food items can be made healthier if you get them without mayo, use fat-free or low-fat dressing, skip the cheese and sour cream, etc.
I'd suggest looking at fast food websites because they list all their nutrition facts. Good Luck!