Ratpoison

Ratpoison is a simple Window Manager with no fat library dependencies, no fancy graphics, no window decorations, and no rodent dependence. Ratpoison is largely modelled after GNU Screen which has done wonders in the virtual terminal market. The screen can be split into non-overlapping frames.... Platforms: *nix

AntiWM is a small and simple window manager with a focus on productivity and utility. Inspired by ratpoison, AntiWM is keyboard driven and handles all windows fullscreen. Platforms: *nix

Salix is a linux distribution based on Slackware that is simple, fast and easy to use. Salix is also fully backwards compatible with Slackware, so Slackware users can benefit from Salix repositories, which they can use as an "extra" quality source of software for their favorite distribution. Like... Platforms: *nix

aewm is a minimalist window manager for X11. It has no nifty features, but is light on resources and extremely simple in appearance. It should eventually make a good reference implementation of the ICCCM. A few separate programs are included to handle running programs, switching between... Platforms: *nix