I'm not sure how similar they are. As I understand it MetaTagger *inserts* meta data into web pages. Webinator is an indexer that *extract* meta data from web pages. You can tell Webinator to index all the meta data or selected items. See Meta Tags and subsequent pages in the Webinator manual. http://www.thunderstone.com/texis/site/ ... =Meta+Tags
The Texis categorizer automatically categorizes based on textual content. It is not available in normal Webinator. If the MetaTagger puts the meta data into the published html pages that you walk with Webinator you can tell Webinator to incorporate that data using the features described previously.
If I understand what you need, you could use Meta tagger together with Texis. That would let you extend Webinator's functionality taking advantage of the Texis database features. You would just insert Metatagger data into the Webinator database.