Facio is a free GUI for computational chemistry softwares (TINKER, MSMS, Firefly, Gamess, MOPAC and Gaussian).

It will be helpful to your study and research on theoretical chemistry.

Current Version  :  25.1.2  (released on July 17, 2023)

For Mac OS X (10.6 or later) and upto macOS 10.14 Mojave,


you can run 32-bit ver. with Wine (stable 5.0)

For macOS (Catalina or later),

For Linux, 64-bit ver. works on Ubuntu 20.04 LTS with Wine64

Facio is named after a Latin verb "facio" which means "I make". So, please pronouce "c" in Facio as [k] as in cat.

This software is indispensable to FMO (Fragment Molecular Orbital) method of Gamess

because it is the only GUI for FMO-specific input and output.

Solvent excluded surface of Decamethylcucurbit[5]uril Molecular orbitals of Benzene (from #12 to #31) Grubbs catalyst, 1st generation

Features at a glance : molecular modeling and visualization of quantum chemical calculations

Last Update : July 17, 2023

Facio has been developed by Masahiko Suenaga,

Department of Chemistry, Graduate School of Science,

Kyushu University, Japan

This website was established

on September 12, 2004.