Void Linux [1] and (OpenBSD [2] or Bitrig [3]). Both easy to install, configure, and use.
OpenBSD has poor multiprocessing performance but Bitrig is working on it. Void seems, in many ways, a better Arch. I mean to try morpheus too at some time when not so busy. I tried Plan 9 but the interface is very strange to me to learn all at once; perhaps this too when not so busy. I would want to properly port it to amd64/arm64 and port or write i3 or equivalent. [1] http://voidlinux.eu/ [2] http://openbsd.org/ [3] http://bitrig.org/