chmod calculator
This is from my early days as a net user, when I was using FTP programs with GUIs that used checkboxes to set file's permissions. I didn't know what checkboxes would translate to 755 for example, and that is why I built this Javascript. Somebody else claimed it was useful, and that's why it remains.
Apparently this kind of thing is still useful. I have created a little application for Mac OS X that lets you do the same thing as this application. You can find it at the Secret About Box