A J2EE-based enterprise search solution. It can search through both structured and unstructured content including relational databases.

IB 2.0 is the commercial "big brother" of the public Isearch package.

Identifies and extracts business intelligence from your data assets.

Similarity Search Engine finds similarities and relationships between data in databases.

Scalable search engine software for corporate web sites and intranets.

Windows/Unix server search engine, includes natural-language querying and document summarization.

Search engine written in Java supports XML, XSLT and EJB.

Perl script indexes and allows Boolean searching. Suitable for indexing up to approximately 4, 000 pages.

Search engine that makes use of hypertext links and paths to provide rankings. Open source project under the GPL.

Book about indexing techniques and a software package that implements the algorithms.