Go to a meetup and introduce yourself to folks and show the project to them there.

I want to reply to afarrell, but I can't.

I think going to meetups would be great! That might actually be my best bet since it's person-to-person and majority technical. It's definitely the target audience at least.

My site is http://www.scriptcat.io -- basically, it emails you if it detects a new open port. "Pingdom for open ports"

(Edit: I could've sworn afarrell's post initially asked what the project was)

Don't be too dismayed by that. When I made my first software sale I also sent a similar message to the customer. In retrospect, while not a rookie mistake, it was rookie over-enthusiasm :)

Looking at some of my old stats, it's probably realistic to expect at most 10% of people to respond to that kind of email.