mwm

For the true minimalist:

• ~40 LOC.
• No default keybindings (just edit the source).
• No title bars, no status bars, no buttons, no borders, no menus, etc.
• No eye-candy.
• No mouse control.
• No virtual desktops.
• No configuration files.
• Absolutely adaptable to your needs.
• Includes just what is strictly needed.
• Not standards-compliant.
• All windows are full-screen, just one is visible at any given time.
• No modes.

Why?

Most software today is crappy. Do you really need all that? I found out through experience that, generally, you don't. Do you really need to have a dozen windows opened simultaneously? When you do, you will need a way to organize that mess. Virtual desktops, window tags, etc. are ways to cope with the symptoms of a underlying issue.

We are in dire need of software that is hackable, fun, small, malleable, and that you can wrap your head around, because: is it truly free software if, due to its complexity, you cannot modify it? ;)

How?

Two macros are available for assigning keybindings: grab and K. Read the source for an example on how to use them (my own setup).

Run ./build.sh. Pass CC= to use a different C compiler (I use tcc).

Dead simple.