I've found Home Assistant [0] to be a solid project that works swimmingly on a raspberry Pi 3. For sensors, the Aeotec (by Aeon Labs) Z-Wave sensors [1] have been reliable for me. The Z-Wave stick I use is from Z-Wave.Me [2] and seems good, too.
[0] https://home-assistant.io [1] https://aeotec.com [2] https://www.z-wave.me/index.php?id=28