The improvements of VTWM over TWM extend WAY beyond the Virtual Desktop.
I love it, I've tried just about every WM on this entire site. Window Management became an obsession. In the end, VTWM won out over all others.
I was looking for functionality, style, and size. VTWM is perfect in every way I could find.
An open, cross-platform journaling program.
A scientific plotting package.