Home Assistant
Home Assistant is a great piece of software written by the guys over at home-assistant.io
I've been using home assistant for over a year now and quickly becomes a fun but expensive hobby, currently I have several cameras and sensors hooked up all powered by Node Red automations to send notifications straight to my phone.

Home assistant is perfect as it can be connected to any device with a web browser and because it integrates with most of the major smart home devices it removes the need to use an several apps to control your home.
I'll share a couple of guides on how to get started and how I implemented some of my automations into my home.