@Sabex @yukiame @Helgi There are lots of distros that don't use systemd, there are even such Debian and Arch forks. I've never used Slackware properly, but I think you'll find Void appealing — that is what I use and it uses runit by default, I think you can even replace it with other init (dinit and whatnots).
There definitely are alternatives moving in the opposite direction — away from systemd.