OPNsense is a FreeBSD, open source firewall and routing software that was first released on the 2nd of January, 2015 codenamed as Ascending Albatross. The software is designed and developed by Deciso B.V, a hardware and support packager provider for OPNsense located in the Netherlands.
This software features a web-based interface that is designed for both i286 and x86-64 platforms. It offers the user to add plug-ins to the original software that includes traffic shaping, load balancing, and a virtual private network for secure browsing. In February of 2015, Manuel Kaspar, the creator of m0n0wall referred the developer community to OPNsense after m0n0wall closed down.