My most recent one was a social network: https://socii.network

Stopped working on it because Mastodon is good enough for me.

I had a Handshake domain registry/registrar: https://neuenet.com

Stopped working on it because Andrew Lee tried to take over the blockchain.

An analytics tool: https://chew.sh

Gauges shut down and I enjoyed that service. My previous domain is now owned by someone who's last name is Chew, which is cool.

Forgot I just let https://design2code.me expire because I didn't put in the work to get my name/services out there.

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I'm currently working on https://nickel.video and think I'll stick with it for awhile. I also registered https://neue.host a few weeks ago, with the idea that a lot of the side projects I had in the past would actually work as a collection of services.