As interest in WAIS seems to be a thing of the past, there's no point in recommending any tool other than this one. It's good at what it does, but most WAIS services today are being handled on the Web.
Can't find what you're looking for? Try a search:
Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
The MacWeb3D web site is an invaluable resource for all things relating to 3D/VRML worlds on the Macintosh. Member Stephen Guynup was instrumental in obtaining much of the VRML-related information on the Orchard.
In March 2007, Cameron Kaiser from TidBITS posted a great article on the state of gopher in our modern world. Check it out!