Thanks for these! They were immensely helpful in the building of my compiler. My compiler would be way, way, less robust (and less of an accomplishment for me) had I not found this body of working, compile-able Jack code.
If the authors read this, I would suggest to them that they provide a link to these projects in the project pages for the compiler chapters.
Every time I had a question about Jack semantics--which was often, since the only language I knew when starting this book was Python--I grep'd these projects. I think had I known some Java (or had more general programming experience), this mightn't've been an issue, but I really wouldn't've made it through had I not found this post.