states Variety of implicit solvent models Wave-function analysis tools enabled by libwfa developed by Felix Plasser and co-workers QM/MM and QM/EFP methods for extended systems Janus QM/MM interface YinYang Atom model without linked atoms ONIOM model EFP method (including library of effective fragments, EFP interface with CC/EOM, DFT/TDDFT, and other methods) Version history Beginning with Q-Chem 2.0 only major releases versions are shown. Q-Chem 1.0: March 1997 Q-Chem 1.1: 1997 Q-Chem 1.2 1998 Q-Chem 2.0: 2000 Q-Chem 3.0: 2006 Q-Chem 4.0: February 2012 Q-Chem 5.0: June 2017 Q-Chem 5.2.2: December 2019 Q-Chem 5.3.2: December 2020 Q-Chem 5.4: June 2021 Q-Chem 5.4.1: August 2021 Q-Chem 5.4.2: December 2021 See also References External links Wavefunction, Inc., Spartan Graphical Interface accesses and includes Q-Chem computational Engines WebMO BrianQC Computational chemistry software Chemistry software for Linux Science software that uses Qt Proprietary commercial software for Linux Proprietary software that uses Qt