Similar to ReactOS

Libavcodec

Libjpeg

Libpng

LibreSSL

Librsvg

Libvirt

Libwww

Lighttpd

Linux-libre

Linux kernel

LIRC

Lis (linear algebra library)

MDB Tools

Mesa (computer graphics)

TinySPARQL

MicroEMACS

MicroPython

Mined (text editor)

Mintty

Mirai (malware)

MPICH

MsQuic

MuPDF

Musl

Mutter (software)

GNU nano

Ncdu

Ncurses