pegboard is a social bookmarking service that lets you save, search, share and tag your bookmarks with people all over the world!
A "plus" version of Sphider (a php-based search engine/crawler).
a php spider and search engine
Nutch is an effort to build an open source search engine based on java lucene for the search and index component.
A _very_ detailed writeup on the "Jagger" update of Google's index.
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