a) a site built on Zope called CodeCatalog <http://www.codecatalog.com/about> which has a searchable index of many popular open source source trees such as Linux, gcc .... It has hyperlinked cross references for most symbols.
Yep.
You may need to register to use.
Nope.
The "about" page above claims that CodeCatalog is built using Zope - don't know if this means the text search is a Zope product or just the site is a Zope site.
The text search is not a Zope product. Zope is simply the front end to the index.
The original technology was built by the SourceGear ( ABiSource word processor) guys and sold to OpenAvenue.com ( owners of CodeCatalog.com) just days before LinuxExpo.
Days? Actually it was more like hours. :-) -- Eric W. Sink, Software Craftsman SourceGear Corporation eric@sourcegear.com