Cheddar is a free real time scheduling tool. Cheddar is designed for checking task temporal constraints of a real time application/system. Systems to analyze can be described with AADL or with the Cheddar architecture design language. It can help you for quick prototyping of real time schedulers. It can also be used for educational purpose. Cheddar is developed and maintened by a team composed of the LISyC laboratory/Université de Bretagne Occidentale and Ellidiss Technologies.