A quick google only unearthed:
1. Arch's xdg-menu, perl-based, supports
2. LXMenuEditor, java-based, supports LXDE and XFCEtwm
ion3
WindowMaker
fvwm2
icewm
blackbox
fluxbox
openbox
awesome
from XDG stuff. KDE, Gnome, Xfce, Enlightenment are already XDG compatible.