An extremely advanced command-line driven, but still easy to use,
repair tool for OS X. Like recovery mode for older Macs, but less
annoying!
First download is for Tiger onwards. Second is for Jaguar & Panther.
Abandoned project page can still be found [here][1].
Compatibility
Architecture: PPC x86 (Intel:Mac)
Must be ran from Single User Mode (Command + S on startup) otherwise
it will case more problem than fix.
[1]:
http://applejack.sourceforge.net