COCO (CAPE-OPEN to CAPE-OPEN) is a free-of-charge CAPE-OPEN compliant steady-state flowsheet simulation environment consisting of an intuitive graphical flowsheet environment (COFE), a thermodynamic and physical property package (TEA), a collection of unit operations (COUSCOUS) and reaction packages (CORN). It also comes with various tools geared to CAPE-OPEN development. The package can be used in conjunction with other CAPE-OPEN models.