Unfortunately, he had to stop development since Russia invasion of Ukraine, as he lives in Kyiv, Ukraine. He said he was OK and would like to continue development "after Ukraine’s victory" (https://github.com/trunkmaster/nextspace/discussions/412). But that was about 4 months ago.
As someone who really likes NeXTSTEP and hopes NEXTSPACE to succeed, the current situation is sad.
Just wanted to inform the crowds at HN about this.
:wq