Preheat oven to 350°F (175°C).
Grease and flour a Bundt pan; set aside.
In a medium bowl, stir together the flour, sugar, cocoa, flax, baking soda, baking powder, salt and cinnamon. Add the eggs, oil and applesauce; mix well. Fold in the nuts and zucchini until they are evenly distributed. Pour into the prepared pan.
Bake for 50 to 60 minutes in the preheated oven, until a toothpick inserted into the centre comes out clean. Cool cake completely before adding your favourite frosting.
Makes 12-14 servings.