The original author, Terry Davis, died in 2018. There have been numerous forks, and ZealOS is one of the active ones. But TempleOS proper will remain as it is.
I first learned about Andreas from seeing one of his videos about TempleOS [1][2] when I was first playing with TempleOS and learning (Holy)C. There are a few forks of TempleOS around, I made a post about one a couple months back. [3]
