I know about OpenWRT and used it for years on various cheap MIPS routers. But back then, the UI did not come with the firmware, you had to install it separately. And it was _very_ basic and there was lots that you still had to do on the command line to get anything done.

Correct me if I'm wrong, but that still looks to be largely true. Except that there are multiple to choose from: https://openwrt.org/docs/guide-user/luci/webinterface.overvi... I had a look at a few, and they all seem to be "managing the router"-centric, not "managing your network"-centric.