Best Open source home Automation system out there.
Except for one, Node-Red.
Node Red is extremely easy to install on a cheap Raspberry pi, it even works well on the Pi zero and older Pi 2 models. and adding functions is as easy as typing a single command in a text window.
How am I using Node Red? I'm using it as a glue layer to my home automation. I have Crestron at my home now as I got so frustrated with reliability of other brands. But I needed to glue some other devices into my Crestron system. Yes I could have written the modules in the Crestron directly by using C# but I am not a good C# programmer and honestly it takes a LOT longer than doing it in Node Red. I simply open TCP sockets to and from Crestron, and use node red to translate for me. I have real crestron motions sensors in the house but I use cheap-o pet immune 433mhz motion sensors outside where I don't care if I have to replace them every 6 months as they are $8.00 each. This lets me do lighting automation such as the outside landscape and house lights are at 25% normally but if I walk over to the side of the house it detects the motion and brings them up to 100% brightness so I can see better to pick up the dog's toys in the yard when it's dark at 6pm in the winter. I also use it for the patio lights as well as notifications. It also lets me add in Door Sensors that are wireless so light actions happen instantly instead of with a short delay like motion sensors have. Plus Crestron does not have a wireless battery operated Door contact sensor... and adding one to the mailbox also gives us a "we got mail" indication on the touch-panels as well as text notifications, etc...
As to the reliability, I have the raspberry pi on the same UPS that the crestron gear is on, in the last 3 months I have had 100% uptime compared to the SmartThings system I just removed completely last night that had a 80% reliability.
Update: Still running extremely strong. Node Red hands down is the best home automation the Open source community has ever designed. I am using it with Crestron and currently have 433 china door sensors, Zigbee bulbs, Wifi China switches, And crestron all talking together to make an automation system that simply just works. It uses Life360 to detect location for automation rules and pushbullet to send me notifications of doors and other events. Luckily a lot of node red modules are expanding at a rapid rate, weather decisions, IFTTT, heck I even have it pulling in data from a cheap walmart weather station into the system. It really is the "glue" that I use in my hodge podge system.