Parabola GNU/Linux-libre is 100% free software: https://www.parabola.nu
As far as I know, it is quite active. Being based on Arch, Parabola is arguably better to learn how GNU/Linux works: you have to install it from the terminal, to choose you own set of packages, to keep up with the latest software (Parabola is a rolling-release distribution) what means less stability... and more learning while solving potential issues. See https://wiki.archlinux.org/index.php/The_Arch_Way
