XCrySDen is a crystalline and molecular structure visualisation program, which aims at display of isosurfaces and contours, which can be superimposed on crystalline structures and interactively rotated and manipulated. It can run on most UNIX platforms, without any special hardware requirements.

XCrySDen allows for real-time capture of display. Several movie encoders are supported, in particular for Animated-GIF convert (imagemagick), gifsicle, or whirlgif are necessary. For AVI/MPEG mencoder or ppmtompeg (netpbm) is required. For window dumps either imagemagick or xwd (x11-apps) needs to be present.