I recall using olvwm (http://www.xwinman.org/olvwm.php http://www.xwinman.org/olvwm.php) on my Linux machine sometime in the mid-late 90'ies (as I had used Sun

I recall using olvwm (http://www.xwinman.org/olvwm.php http://www.xwinman.org/olvwm.php) on my Linux machine sometime in the mid-late 90'ies (as I had used Sun workstations at a summer job and I liked the look of it). Not sure it's FOSS per the DFSG criteria, but at least it was available with source under a somewhat free to use license.