Devuan is a relatively new fork of Debian: it started in 2014 as a reaction to the decision made by Debian to switch to systemd as the default init system. A group of users attached to sysv and opposing (real or perceived) drawbacks to systemd started Devuan with the objective of maintaining a systemd-less system. As of March 2015, they haven't published any real release: it remains to be seen if the project will succeed and find its niche, or if the systemd opponents will learn to accept it.