MacsBug 6.6.0
When your Mac crashes, MacsBug presents you with a scary-looking screen filled with hexidecimal numbers and bad voodoo spells. Who wants that? You do. Try typing "ES" (shorthand for Exit to Shell) and pressing Enter. If you're lucky, you've returned to your Macintosh, sans whatever program it was that crashed. If your'e not lucky, you'll find yourself back in MacsBug: type "RS" and press Enter to reboot your Mac. More advanced users can try reprogramming the offender on-the-fly in memory, which can occasionally save one's hide and allow the application to continue running. All in all, it's better than the "Your Mac Has Crashed" dialog box, even for novice users.
See Also: MacsBug 6.6.3, System Error Patch, TMON, Jasik debugger (external link)
CompatibilityArchitecture: 68k
Requirements: Works on any Macintosh from the Macintosh Plus forward.
Comments
We already have the 6.6.3 version of this (with the same Tyler Sable arguments for using it as a non-developer) at http://macintoshgarden.org/apps/macsbug-663
It's "MacsBug", as in "Motorola Advanced Computer Systems Debugger", referring to its origins when it was originally developed by Motorola. Not "Mac Debugger"; https://en.wikipedia.org/wiki/MacsBug
Maybe it's worth having "Macbug" and "Macbugs" pages to address the obvious typos for MacsBug.
EDIT: Though this reply alone now mentions the typos. It should cover the problems in finding this very helpful tool in Garden search.