full-featured tiling X window manager for Emacs built on top of XELB. It features:

Fully keyboard-driven operations
Hybrid layout modes (tiling & stacking)
Dynamic workspace support
ICCCM/EWMH compliance
(Optional) RandR (multi-monitor) support
(Optional) Builtin system tray
(Optional) Builtin input method
Found on https://news.ycombinator.com/item?id=22457846, where I read the intriguing comment "I have been using it exclusively on my machines for the past three years. By far the best computing environment I have used." from Vladimir Sedach.