What assistant / software to use for DIY system

Hi all, i'm in the pnaing stage of basic automation for my home

I have a bunch RPI 3b+ / 4B+ and i have access to the mains box where all the light switches in the house are connected and want to use a relay / SSR board driven by a RPI

But I would like an autonomus sytem not cloud based

What should i install ??

Submitted by LeborgneRemarkable

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