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Home Assistant 2023.12: Welcome home!
(www.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
You can create a generic thermostat with a switch and temperature sensor. I do this for my 3D printer enclosure when I needed to keep it warm in my basement with a smart switch and a cheap plug in heater.
https://www.home-assistant.io/integrations/generic_thermostat/