TP-Link Kasa is nice. They can be controlled locally, and the official app (which is needed to initially set up the plug) doesn’t require an account - there’s a “skip” button if you press login.

Thanks, I'll try it out.

Tasmota is a fully open source firmware that can be flashed onto lots of cheap WiFi smart plugs and bulbs, and has a lot of power-user features. "Sonoff" hardware is probably the best supported, and is very cheap.

Right on, I really appreciate it.