
1) Free software programmed in C
Found on
https://www.crosswordclues.com/clue/openbsd

OpenBSD is a Unix-like computer operating system descended from Berkeley Software Distribution (BSD), a Unix derivative developed at the University of California, Berkeley. It was forked from NetBSD by project leader Theo de Raadt in late 1995. As well as the operating system, the OpenBSD Project has produced portable versions of numerous subsyste...
Found on
http://en.wikipedia.org/wiki/OpenBSD
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