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Protein Explorer, a RasMol-derivative, is the easiest-to-use and most powerful software for looking at macromolecular structure and its relation to function. And it's free! It runs on Windows or Macintosh/PPC /Linux/Unix computers.RasMol users will find its menus very familiar, and it understands RasMol commands. It is very fast: rotating a protein or DNA molecule shows its 3D structure"