Tiny Core Linux

Tiny Core Linux is a modular, minimalist Linux distribution that fits into an incredibly small ISO size (often under 20MB). It is designed to run entirely in RAM, making it lightning-fast even on ancient hardware. It provides a base system that users can extend by installing 'extensions' as needed.

While this makes it highly customizable, it also means the out-of-the-box experience is very sparse and requires significant manual setup. It is not a general-purpose OS for most users, but it is a fascinating tool for developers and enthusiasts building custom, stripped-down systems.