A low-cost food API giving you access to a ton of recipes, nutritional information and more. Edamam offer licensing on a subset of their recipes too.
A powerful, low-cost food API that can to do everything from nutritional analysis to building shopping lists and meal plans.
The "largest verified nutrition database”. Useful for looking up food product and nutritional information. Also includes restaurant lookup based on location (USA only).
An open source database of food product and nutritional information. Data is user-generated so can vary in quality. One of the few tools to offer a database dump.