A bunch of FOSS hardware and software. https://twystlock.com was my latest creation. My next is a suite of modular open source home automation sensors including everything from air quality to mmWave presence.

In a more “professional” FOSS sense I just presented a new federated identity management system at IIW based on ActivityPub and OpenID Connect: https://fedid.me.

I also make a lot of behind the scenes algorithms.