OPNsense bụ ebe mepere emepe, FreeBSD dabeere na firewall na sọftụwia ụzọ nke Deciso mepụtara, ụlọ ọrụ dị na Netherlands na-emepụta ngwaike ma na-ere ngwugwu nkwado maka OPNsense. It is a fork of pfSense, which in turn was forked from m0n0wall built on FreeBSD. Ewepụtara ya na Jenụwarị 2015.