Trashwiki is the best resource out there. Write any tips about dumpster diving in any city to there instead of Nomadwiki, please.
- Worldwide Dumpster Diving Google Map - Add new location easily by typing place name or address.
- Falling fruit - dumpsters
Froodly it's an app that shows you where to get discounted food, for the moment it's just working in Helsinki and you can't get stuff for free, but with time it may be popular in other countries and could incentive Supermarkets to give away food nearly for free (hopefully even completely for free!)