They do! https://github.com/inkandswitch

And Ivan's is here. https://github.com/ivanreese

But "public release of hest" was a joking reference to the fact that he's stated quite clearly that the project is just a testbed for him and will never be released. (No matter that every once in a while it makes the rounds of sites like this and everyone goes a-twitter...)

https://ivanish.ca/never/