It's not so much the other VPN products out there, rather no time and no other core developers. There have been lots of people contributing, some much more than

It's not so much the other VPN products out there, rather no time and no other core developers. There have been lots of people contributing, some much more than others, but usually it was just to scratch their itch, after which they move on (which is perfectly fine). I'm not sure how to revitalize development if there is not a large interest from developers, and I don't want to turn this into something commercial like OpenVPN did.