NYT Cooking - iPhone app with 17,000 free recipes from The New York Times
Yummly - Yummly is a recipe app. You search through lots of recipes, add the ones you like, and even create shopping lists based on the recipes you pick. You can save your recipes with one click and later organize them into collections.
Hello Egg - Your home-cooking sidekick
YoRipe - Easy, healthy and personalised recipes for busy households
Tasted - Your voice-enabled cooking companion
OnlyEats - OnlyEats is a visual search engine that helps you discover what to cook for any occasion or diet.