iCab was a favorite of mine before the switch from Classic Mac OS to Mac OS X. I made heavy use of its ability to save offline copies of open web pages (with all embedded resources).
http://www.icab.de
Sometimes I'd like to see an alternate reality in which OpenDoc (and with it Cyberdog) really took off. I really liked the concept, but all the practical uses were really rough around the edges and somewhat slow, just like Cyberdog.
[0] https://en.wikipedia.org/wiki/Cyberdog