JessX Project's main goal is to create a program allowing for the simulation of a financial market with realistic features (such as an order book and realistic orders). Researchers and teachers in Finance may find it helpful in their works. It is, ceteris-paribus, inspired by the Euronext- NYSE microstructure (order-driven, continuous).JessX Project's main goal is to create a program allowing for the simulation of a financial market with realistic features (such as an order book and realistic orders). Researchers and teachers in Finance may find it helpful in their works. It is, ceteris-paribus, inspired by the Euronext- NYSE microstructure (order-driven, continuous).