I've always been surprised that there was no good low-cost utility to do this for ZIP files. I remember doing this with various compressed formats about a decade ago, and could not figure out why no one had made a free (or donation) program to do it for ZIPs.

Think about how useful it is to peek into a large archive to see if you compressed something as part of a large group. Or, being able to pull out just one file, rather than decompressing thousands.

The look is a little ugly since it is Java-based, but the developer did a good job making it friendly enough. Would love to see a Cocoa-native version some day, but this is great for now!