OpenWRT is a iot operating system. It can run anywhere and everywhere. You can totally run it on enterprise gear and x86 machines. It can work as a firewall or a operating system for a light bulb. It also has the advantage of being very extensible and you can build custom images that have only the stuff you need.
The downside is that even though the wiki is fairly good it still requires a good amount of networking knowledge to use. It isn’t bad and it ships with sain defaults but if you want to get advanced you need to know what you are doing.
It also lacks a mechanism for automatic security patching. You need to manually update it which is easier with attended upgrades but it still requires button pushing and downtime.