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Sortix aims to be a "clean and modern POSIX implementation". POSIX mandates, say, ed[1]. Xv6 does not implement ed; it's absolutely spartan.

TCP/IP support

Author here. Yep, though the network stack hasn't yet been merged to the master branch (but that's next and it'll be in the next stable release).

For starters, its own libc and a proper filesystem (the author wrote their own ext2 implementation).