The developer of Threema and m0n0wall, Manuel Kasper, announced the end of the m0n0wall project: http://m0n0.ch/wall/end_announcement.php What do you think about the recommended offspring OPNsense https://opnsense.org/
I am going to check out OPNSense soon. I have used PFSense for the past year or so and find them to be doing an excellent job. Before that it was untangle but I don't like where untangle is headed.