I use LoseIt! to track. I paid for the premium (waited for a sale so it was $20/year) so I can see a bit more information, but the free version works fine as well.
My favorite fiber sources:
Carb Balance Mission burrito tortillas - 28 g fiber (I use them for burritos, wraps, and breakfast quesadillas)
Reduced sugar Ocean Spray cranberries - 10 g fiber in 1/4 c (I pair it with some almonds -- which also have fiber -- for a little snack)
Olipop soda - 9 g fiber in most cans. The grape and crisp apple are my faves, but the root beer isn't bad.
Popcorn - 3 g fiber per serving (which is about 2-2.5 c)
Raspberries - 8 g fiber per cup
Apples - 4-5 g fiber per
Chia seeds - 10 g in 1 tbsp (I add them to my overnight oats)
Oats - 4 g in 1/2 c
Those are some of my staples. Hope that helps!
We like the Mission tortillas, have to tell husband to go look for the carb balance variation, looks like a fantastic easy way to up fiber.