> NetBSD/FreeBSD Bit of a nitpick, but I think you meant NetBSD/OpenBSD? AFAIK both FreeBSD and NetBSD independently continued the abandoned 386BSD project, bu

> NetBSD/FreeBSD Bit of a nitpick, but I think you meant NetBSD/OpenBSD? AFAIK both FreeBSD and NetBSD independently continued the abandoned 386BSD project, but there was never any strong relation between the two projects (they did share code later on). OpenBSD did split from NetBSD, after Theo de Raadt was removed. Other examples: FreeBSD/DragonFlyBSD, Vim/NeoVim, Mplayer/mpv, (Open)Solaris/illumos, MySQL/MariaDB, probably some more.