How are you wanting to "browse" the archives? If you just want to see a dump, type (for .zip):
jar ftv [ARCHIVE_NAME]
and it will dump it out for you. If you want to "browse" the archives from a web server (E.G., to serve the contents of a .zip file as if it were the root of a web site), there is java code to do that also.
Stuffit files are pretty much up to Aladdin to implement.