PsiViewer is a Java OpenGL-based 3D-graphic visualization tool for viewing and analysis of results from quantum chemistry calculations.
Source: CSE-Online
Features
Graphic functions
Display molecules in Balls&Sticks, Sticks, Overlapping Spheres.
Plot iso-density surfaces in wireframes, solid, and transparent modes.
User-defined preferences for changing display options such as ball size and color, background color, etc.
Analysis functions
Measure bond distances and angles.
Plot of total electron density and molecular orbitals from Gaussian cube files