DWSIM is a free and open source CAPE-OPEN compliant chemical process simulator that operates across multiple platforms, including Windows, Linux, macOS, Android, and iOS. It features an intuitive graphical user interface and offers capabilities previously exclusive to commercial simulators. DWSIM supports both steady-state and dynamic simulations, utilizing a parallel modular solver for efficient modeling. It includes advanced property packages. The simulator provides a comprehensive suite of unit operations, including mixers, splitters, separators, pumps, compressors, expanders, heaters, coolers, valves, pipe segments, shortcut columns, heat exchangers, various reactors, distillation and absorption columns, solids separators, cake filters, spreadsheets, Python scripts, and flowsheet unit operations. It also provides an Excel Add-In for performing thermodynamic calculations within spreadsheets and an automation API for creating, loading, modifying, running, and saving flowsheets.