This article is from the MachTen & CodeBuilder FAQ, by Jaime Julca firstname.lastname@example.org with numerous contributions by others.
Because MachTen is a complete UNIX system, MachTen supports local X clients.
The MachTen X Window Software includes a local Motif Window Manager (mwm)
and an Open Look Virtual Window Manager (olvwm). The sources to many X
client applications are included as example programs, along with a complete
X client development environment and a Motif toolkit.