CHEMCAD is described as 'is Chemstations’ intuitive suite of chemical process simulation software that broadens an engineer’s capabilities and increases productivity' and is an app in the Development category. There are four alternatives to CHEMCAD for Windows and Linux. The best alternative is DWSIM, which is both free and Open Source. Other great apps like CHEMCAD are Aspen Plus (Paid), COCO Simulator (Free) and Pro/II (Paid).
Aspen Plus is a market-leading process modeling environment for conceptual design, optimization, and performance monitoring for the chemical, polymer, specialty chemical, metals and minerals, and coal power industries.
PRO/II® process simulation software is a steady-state simulator enabling improved process design and operational analysis. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes.