An advanced open source fulltext indexing package available from:
http://xapian.org/

It includes bindings for some scripting languages including a [SWIG] generated Tcl binding, properly packaged as a [stubs] enabled Tcl package since version 0.8.4.

Releases 1.0.6 and earlier had a few bugs associated with the installation location, but
newer releases should just build out of the box, so if building from source, use 1.0.7 or
later.

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[schlenk] This could be a base for a very nice search engine to be added to tclhttpd or rivet for example. Or maybe even as an additional search engine for the wiki?

[CMcC] if you use a [metakit] store for the pages, you can just use the select -keyword option and get fulltext search aka [KWIC]

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A benchmarking comparison of open source search and indexing applications, which encompasses both Xapian and [sqlite], can be found at: [http://zooie.wordpress.com/2009/07/06/a-comparison-of-open-source-search-engines-and-indexing-twitter/]
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[Category Package]