An intuitive molecular editor and visualization tool
Avogadro is an advanced molecular editor designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science and related areas. It offers a flexible rendering framework and a powerful plugin architecture.
PyMOlyze is a graphical program to analyze the results of quantum chemistry (HF/DFT) calculations. Features include various population analyses, fragment analysis, monitoring structures during an optimization, and a simple, but powerful, XYZ editor.