Fine. I'm starting Severus, which actually deals with "contacts, business cards, email addresses", but with some interesting privacy mechanisms. I haven't quite launched yet, but I've seen this topic come up frequently on HN, and I never talk about it. I need to get out of my comfort zone and talk about it.
Okay, here you go. I have an amazing day job. But I always wanted to build some software utility that others found value in. So I shipped a forum platform. Because I can’t bring myself to share this with my friends and professionals network, it has no users: https://discoflip.com/