Version 0.10 of package Inspector has just been released in GNU ELPA. You can now find it in M-x list-packages RET.
Inspector describes itself as: ========================================= Tool for inspection of Emacs Lisp objects ========================================= More at https://elpa.gnu.org/packages/inspector.html ## Summary: Tool for inspection of Emacs Lisp objects. Usage: M-x `inspector-inspect-expression' to evaluate an elisp expression and inspect the result. M-x `inspector-inspect-last-sexp' to evaluate last sexp in current buffer and inspect the result. Inside the inspector: M-x `inspector-pop' bound to letter l, to navigate to previous object. M-x `inspector-quit' bound to letter q, to exit the inspector. Also, M-x `forward-button' and M-x `backward-button' are conveniently bound to n and p. They can be used for fast navigation across the buttons that the inspector displays. Finally, you can use M-x `eval-expression' bound to letter e, to evaluate an elisp expression using the object currently being inspected (it is bound to *). From the Emacs debugger: ## Recent NEWS: [Not available 🙁]