There are technical reports on the software.
- Tiny HTTP Proxy in Python
- UTF-8 Cygwin
- An experimental 'LINQ to Objects' in Go
- A fast Lisp interpreter in Dart
- A Lisp interpreter in TypeScript
- A revised Lisp interpreter in Go
- circlisp: A Circular Lisp Interpreter in Common/Emacs/Nukata Lisp
Japanese page is here.