How a Finnish student's 1991 hobby kernel, posted to a Usenet group with the caveat that it "won't be big and professional like gnu," collided with a free GNU userland, a frozen BSD lawsuit, and the GPL — and became the operating system of the cloud, the supercomputer, and three billion phones.
Android
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The Story of Linux -
Repurposing Old Phones and Mini PCs: Giving Retired Hardware a Second Act How to give retired phones and mini PCs a useful second life — low-power servers, thin clients, and self-hosted services — covering postmarketOS, Android options, and the workloads these efficient little machines handle well.