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Philips Hue will force users to upload their data to Hue cloud - Home Assistant
(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
Nanoleaf bulbs are great and their Essentials line work offline without an account.
I wouldn't say they're great; they're adequate. There's a lot of issues with the bulb firmware that still needs ironing out both with stability and feature set.
What features are you missing?
Basic features like turning a bulb on with a set brightness or color (if you're lucky, you can turn on with a set brightness). No support for scenes (due to matter spec) which can lead to issues sending commands to light groups. And if you want to actually update bulbs good luck because it's buggy as hell.