[acd]

FreeBSD an entire operating system runs on about 100MB ram. https://www.freebsd.org/doc/handbook/bsdinstall-hardware.htm...

[znpy]

CentOS 7 is roughly the same.

For a minimal install (with ssh service and vsftpd), i booted it and flushed the filesystem cache, then ram usage was about 88MB.

[Koshkin]

Heh, the recommended amount of RAM to run Windows 95 was 8MB.