Architext NLS, Boolean and SQL queries. Automatic abstracting. Distributed database model. Automatic subject grouping. Small index overhead. Fulcrum NLS, Boolean and SQL queries. Couples with relational databases. Multinode server searching. Oracle Couples with Oracle relational databases and their search engines and other Oracle tools. NLS and SQL queries. Query-by-theme. Master index. API. PLS Specialist of text retrieval. Almost any feature, including distributed database model. Unclear whether it can couple with relational databases. TRW-search Manages other search engines and databases (not a search engine itself). Provides a unified interface. Virtual databases. Verity Topic agents. Query by example. Integrated with netscape server. Unclear whether it can couple with relational databases. WAIS Search engine incorporated into its own server. Web interfaces exist. NLS mixed with boolean queries. Relevance feedback. Server on UNIX, but clients anywhere. Many binary format filters available. Unclear whether it can couple with relational databases.