The Slackware Linux Enthusiasts has made the community product named as Slackware ARM on Raspberry Pi (SARPi). It is called as one of the best Raspberry Pi Operating Systems today.

You will be provided a tutorial containing a step-by-step, how to install and use Slackware ARM on Raspberry Pi guide
You can download and install it on an 8GB SD card
It supports most of the applications made for the ARM architecture
The easier installation process and tutorial guide will help the beginners to use it without any difficulty