Looks like an secure and open source web engine, so they say.

relayd
A FREE load-balancer, application layer gateway, transparent proxy, and SSL/TLS gateway.

httpd New
A web server that is based on relayd. It is secure, serves static files and supports FastCGI and TLS.

An OpenBSD Project
relayd and httpd are developed as part of the OpenBSD Project. The software is freely usable and re-usable by everyone under an ISC license.

http://bsd.plumbing/

This project didn't release any stand-alone binary distributions yet.

First you need OpenBSD: http://www.openbsd.org/ftp.html

nginx with a bit of theo's cum sprinkled on top, just like openssl, netbsd or ssh.com? sing me up!

oh right, its one of those things they did from scratch... uh, err, awkward [softly threading backwards, retracing my steps in reverse]