ArgusLab is a molecular modeling, graphics, and drug design program for Windows operating systems. It’s getting a little dated by now, but remains surprisingly popular. To date, there are > 20,000 downloads.
ArgusLab is freely licensed. You don’t need to sign anything. You can use as many copies as you need if you are teaching a class where your students might benefit from using ArgusLab. You are not allowed to redistribute ArgusLab from other websites or sources. However, you may link to this website from your own websites if you like.
A low-key effort is currently underway to port ArgusLab to the iPad. In addition, I’ve done some work with the Qt cross-platform development environment in an effort to support Mac, PC, and Linux.....no promises!