I-OPNsense ngumthombo ovulekileyo, i-firewall esekelwe kwi-FreeBSD kunye nesofthiwe yomzila eyenziwe nguDeciso, inkampani yaseNetherlands eyenza i-hardware kwaye ithengise iipakethi zenkxaso ye-OPNsense. Yifolokhwe ye-pfSense, eyathi yona yafakwa ngefolokhwe kwi-m0n0wall eyakhelwe kwiFreeBSD. Yasungulwa ngoJanuwari 2015.