InGrid is a simple tool that does its work on the background. It checks every second, or a time you specify in the preference panel, the position of all icons and tries to arrange them in a grid. I wrote this tool since when I work I have a lot of open and minimized windows.
This app is written in Cocoa Objective-C for OPENSTEP/Mach version 4.2, on Intel hardware. You will need Opener.app to unpack the ".tar.gz" package.
If you are a brave soul and still use OPENSTEP, drop us a line we would be delighted.