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>BSD

OpenBSD's latest significant version was less than 3 months ago

>Perl 5

5.18.2 was released this year

>XHTML

1.1 was released a bit more than four years ago

The fact of the matter is that old, unupdated software holds everyone back.

WindowsXP was updated patch Tuesday.

The common term "bitrot" suggests otherwise

Bitrot typically refers to individual bits flipping (due to cosmic rays or device failure or whatever), which spoils one copy of the software if you do nothing to correct it, but isn't the same thing as a version no longer being relevant.

According to Wikipedia, "[OpenBSD] was forked from NetBSD by project leader Theo de Raadt in late 1995."

As long as it interfaces with anything else, it does.

If your software is completely isolated and self contained, sure, there's no practical bitrot.

But the Internet changed the software world - software rots out in the wild.