The Free Energy and Advanced Sampling Simulation Toolkit (FEASST) is a free, open-source, public domain software to conduct molecular and particle-based simulations with Monte Carlo methods.

:doc:`/plugin/README` contains the list of features available. Some features include but are not limited to the following:

Monte Carlo simulation techniques

• Metropolis
• Wang-Landau
• Transition-matrix
• Mayer-sampling

Thermodynamic ensembles

• Microcanonical ensemble
• Canonical ensemble
• Grand canonical ensemble
• Temperature and growth expanded ensembles

Monte Carlo trials

• Translation, rotation, crankshaft, pivot
• Rigid cluster rotation and translation
• Configurational bias transfers and partial regrowth
• Dual-cut configurational bias
• Aggregation volume bias
• Reptation
• Branches

Interaction potentials

• Hard spheres
• Lennard-Jones with LRC, cut and force shift
• Patchy particles
• Yukawa and charged interactions
• Ewald summation and 2D slab correction
• Bonds, angles and dihedrals
• TraPPE small molecules and n-alkanes
• Slab, cylindrical and spherical confinement
• Cell list and neighbor list

Modern software

• Interface with C++ or as a Python module
• OpenMP parallelization and prefetching
• Checkpoint files to save, restart and analyze simulations

[apt/yum/brew] install g++ cmake git python3
git clone https://github.com/usnistgov/feasst.git
mkdir feasst/build
cd feasst/build
cmake ..
make install -j4
# optional python packages for feasst tutorials
pip install ../pyfeasst jupyter matplotlib pandas scipy

The executables fst, which is used to start a simulation, and rst, which is used to restart a simulation, should now be located in /path/to/feasst/build/bin/.

Please :doc:`/CONTACT` us if you run into an issue not listed below.

CMake version is usually too old. Try the command cmake3 instead of cmake.

• Install Windows subsystem for Linux (Ubuntu 16)
• See Ubuntu 16

• Update to CMake 3 (https://cmake.org/download/)

• for omp, try brew install libomp

• OpenMP functions apparently do not work unless the cray programming environment is disabled.

• We are not aware of any issues with these OS.

You can access the documentation of a specific version of FEASST as follows.

git clone https://github.com/usnistgov/feasst.git
cd feasst
git checkout nist-pages
git log
# find the commit of your version from git log
# (e.g., 0.19.0 is a50b4fe943832f012373f23658a9497990d70d21)
git checkout a50b4fe943832f012373f23658a9497990d70d21
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