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

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

FeOs - A Framework for Equations of State and Classical Density Functional Theory

Plotting recipes for equations of state

A Julia package for fitting the equation of state of solids, and more

Thermodynamic Equations of State, Fortran library with both automatic and anallytical derivation capabilities

NeqSim is a library for calculation of fluid behavior, phase equilibrium and process simulation. This project is a Python interface to NeqSim.

Software for the AsyEOS/R3B experiment

common astrophysical microphysics routines with interfaces for the different AMReX codes

A frozen shock solver for ideal and real gas equations of state.

Shock Impedance Matching Code

Program to calculate phase boundaries of multicomponent systems using Equations of State. WIP now suporting PT envelopes and PX envelopes with partial three-phase-behaviour

An open-source package for neutron star whole workflow Bayesian nference constraining Neutron star EOS package

Pytherm: An open-source scientific tool for thermodynamic modeling

Code written by Eric Lemmon. Posted on the NIST website. But now in JavaScript, the best EOS for natural gases straight from the browser.

PyForFluids: Fluids Properties Based on Equations of State

DESPASITO: Determining Equilibrium State and Parametrization Application for SAFT, Intended for Thermodynamic Output

A code for calculating the standard state thermodynamic properties at a given temperature and pressure.

WIEN2k plug-in for AiiDA workflow management