Try The Apartment is one real apartment turned into a 3D room in your browser (a specific apartment, the one Jingtao viewed last week and filmed on his phone like we all do). You walk it at eye level, drag your furniture in, get warned when the couch won't fit, open the doors, and send the link to whoever you're moving in with so they can rearrange your layout and be wrong. He built it from that shaky viewing video in a day, no 3D background, for a job that used to mean a 3D artist and most of a week of somebody's time, and he lays out the whole recipe in the launch thread, so the viewing video sitting on your phone from last weekend can become one of these. And he might not even take the place.

Reactor Atlas is one map of every nuclear reactor on Earth since 1954, built because the official records apparently can't agree with each other: the IAEA keeps theirs in PDFs, Global Energy Monitor has a spreadsheet, Wikipedia says a third thing. Federico is a nuclear engineer who got annoyed enough to reconcile the lot, and along the way he found 31 reactors listed with the wrong operating status, including two in his own country marked suspended while they were running at 68% capacity. The map is free and live, and the method travels, because every industry has its version of records that only exist in contradictory PDFs, waiting for one annoyed person with an agent. I have no use whatsoever for this map and I have been on it for ten minutes.

cubicles.lol is a multiplayer town where your website becomes a little building people can walk into (drop your link in, you get a branded cubicle to decorate): check out the neighbors, see what they're building, steal their car, lose a typing race to a stranger. Matt's pitch is that everyone on the internet bought a billboard and nobody came to town, his words, so he built the town, solo, in four days on Astra, six billion tokens and very little sleep. The cars are amphibious because he wondered mid-build whether they could be, and ten minutes later they were. There's a blimp. You can hijack the blimp.