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InfluxDB
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Recently saw a guy do a really cool E-Ink display for smart homes here:
https://github.com/Madelena/esphome-weatherman-dashboard
He lists out the materials and code he used. He went with a low cost / low power ESP32 microcontroller. This is fine if you mostly want to do lower resolution, static stuff. Here you could design something that'd run off batteries for quite a while.
If you're into fancy animations, maybe some videos, then you'd need to go with something a bit more beefy, closer to a Raspberry PI running some sort of *nix, potentially with some browser to render beautiful pages :)
Obviously there's significant price difference between the two approaches, but there's also some pros and cons you'd need to consider.