Website to download: http://www.acdlabs.com/resources/freeware/chemsketch/
Website to download: http://www.chemsoft.ch/qc/mpc.html
The Open Babel GUI
Website to Download: http://openbabel.org/wiki/Instal
A variety of molecular properties, ranging from simple dipole moments to frequency dependent hyperpolarizabilities may be computed. Many basis sets are stored internally, together with effective core potentials or model core potentials, so that essentially the entire periodic table can be considered.
Most computations can be performed using direct techniques, or in parallel on appropriate hardware. Graphics programs, particularly the MacMolplt program (for Macintosh, Windows, or Linux desktops), are available for viewing of the final results, and the Avogadro program can assist with preparation of inputs.