Peppermint OS
Peppermint OS is a Debian- and Devuan-based (previously a Lubuntu-based) Linux distribution that aims to be fast and easy on system resources. By employing its Site Specific Browser, Peppermint integrates seamlessly with cloud and web-based applications.
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Tiny Core Linux
Tiny Core Linux is a 16 MB graphical Linux desktop. It is based on a recent Linux kernel, BusyBox, Tiny X, Fltk, and Flwm.