MLVWM is a lightweight Macintosh-[L]ike Virtual Window Manager for X11: <http://www2u.biglobe.ne.jp/~y-miyata/mlvwm.html>
I have been using it on OpenBSD 6.4 thru 6.8-current and find it stable on i386 & amd64. I'd love to have someone test on macppc (it seems rather appropriate) and other platforms. If you need additional configuration files for testing, please see my mlvwmrc project: <https://github.com/morgant/mlvwmrc>. Despite its age, I do intend to maintain this port. I am currently trying to reach the original author as it was released as freeware with source included. It's okay to distribute, but I need to obtain proper permission to do further new development beyond patches in the port. Morgan
mlvwm.tgz
Description: application/gzip
