In particular, if you have an iOS device, the $7 third-party rules engine app, smartrules, offers a nice simple way to set up many rules. Combined with SmartTiles, it adds a lot of usability to the system.
On the other hand, the free smart app, Rule Machine, can do many more complicated things but is itself more complex to understand and use.
Both are very popular. Many people with iOS devices even use both of these, using smartrules for anything it can handle, and rule machine for the more complex stuff.
