If you have ever done any research into cooking Sous Vide, you likely have come across the writings of Douglas Baldwin. He is a math geek who has done incredible amounts of research and calculations around cooking food via the Sous Vide method.
He is now working with Chefsteps and they have published an interesting tool that helps you to cook an egg exactly how you like it. You decide how firm you want the yolk and the white and it tells you how long to cook the egg and at what temperature. It even lets you fine tune the calculations by measuring the circumference of the egg, starting temperature of the egg and the style of Sous Vide cooker you are using.