ʻO OPNsense kahi kumu wehe, FreeBSD-based firewall a me nā polokalamu alahele i hoʻomohala ʻia e Deciso, kahi hui ma Netherlands e hana ana i nā lako a kūʻai aku i nā pūʻolo kākoʻo no OPNsense. ʻO ia ka mākia o ka pfSense, a ua ʻoki ʻia mai ka m0n0wall i kūkulu ʻia ma FreeBSD. Ua hoʻomaka ʻia ma Ianuali 2015.