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2023.10: New looks and more tile card features!
(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
There are user accounts and you can restrict dashboards on a per user basis, but it's clunky currently and could do with being expanded.
These limitations should not be misconstrued as security. Anyone with an account can still interact with any device in any way accepted by HA. And just because they can’t see them on the dashboard doesn’t mean they can’t see them through various other methods.