OpSim is an open source Chemical Engineering Process Simulator with a user friendly drag-and-drop graphical user interface and an underlying high performance simulation engine.

The Chemistry Development Kit

Thermodynamics and Phase Equilibrium component of Chemical Engineering Design Library (ChEDL)

NeqSim is a library for calculation of fluid behavior, phase equilibrium and process simulation

Minimalistic chemical process simulator based on the IKCAPE thermodynamic specifications.

A Julia wrapper for CoolProp, offering access to thermodynamic properties for fluids and mixtures.

Clapeyron provides a framework for the development and use of fluid-thermodynamic models, including SAFT, cubic, activity, multi-parameter, and COSMO-SAC.

Thermophysical properties for the masses

Connection scripts for Aspen Hysys with Excel (VBA), Matlab, Python and Unity