AtroxDev

Changelog.com is using Phoenix. They also recently gone open source: https://changelog.com/posts/changelog-is-open-source

From their FAQ:

What does Gogland mean? This is a codename and not the final product name. Our inspiration was the name of an island in the Gulf of Finland, not very far from Kotlin.

Wow, I did not expect that. I'm currently using VS Code for Go and I'm pretty happy with it. Definitively gonna try this out because I'm pretty much using JetBrains for everything else and never got disappointed by them yet.

You can just delete the Modal manually from the DOM and try it out without signing up.

Wow, I enjoyed the first video in the post way more than expected. Looks very promising.

A bit Off-topic: Definitively watch Westworld if you have some time to spare. Only three episodes aired so far and every single one of them was amazing and worth to watch IMHO.

You can. There are some ROMs available that do this. Maru for example: http://maruos.com/