This website uses information from OpenStreetMap to show vegetarian and vegan friendly restaurants on a map. I really like the fact that when I tag a restaurant with the key diet:vegetarian or diet:vegan in OpenStreetMap that it shows up on OpenVegeMap nearly instantly.
Spirit Rotterdam is a buffet restaurant with lots of vegan food. You can fill your plate yourself from a buffet and you pay per weight. The taste of the food is excellent, and the number of choices is great. Highly recommended!