EasyHybrid: An Interactive Graphical Environment for Quantum, Classical and Hybrid Simulations with pDynamo3

Abstract

We present EasyHybrid, a free and open-source graphical interface for hybrid quantum chemical/molecular mechanical (QC/MM) simulations built on the pDynamo3 library. The software provides an intuitive environment for preparing, inspecting, and editing molecular systems, while supporting a broad range of simulations, including reaction coordinate scans, molecular dynamics, normal-mode analysis, Nudged Elastic Band, and umbrella sampling. Key features include advanced 3D visualization of large biomolecular systems, interactive editing, flexible atom selection, system pruning for efficient QC/MM setup, orbital and electrostatic potential surfaces, automated log parsing, and trajectory analysis. EasyHybrid integrates these tools into a single platform, offering a familiar yet specialized environment for quantum chemistry and hybrid QC/MM simulations.