1)   Examine32 4.31
Examine32 is a fast and versatile text search utility. It can search both text and binary files using ordinary text, logical operators, and GREP-like regular expressions. Files within ZIP archives can be searched.
Text Search Utility, Text Retrieval, GREP,

 2)   dtSearch Desktop with Spider 7.10
dtSearch is "the most powerful document search tool on the market"-- Wired Mag. Searches terabytes of word processor, database, spreadsheet, ZIP, XML, PDF, HTML, emails & more. Built-in Web Spider. See www.dtsearch.com for more products.
Search, dtSearch, find, documents, files, data retrieval, text retrieval, searching, full-text, indexed,

 3)   ISYS:web 7
ISYS:web 7 is an easy-to-deploy search solution for websites, intranets and portals. ISYS:web 7 supports more than 30 foreign languages and 140 file types, including standard formats, web content and databases.
intranet search, search software, search engine, enterprise search, text retrieval, information retrieval,

 4)   ISYS:desktop 7
ISYS:desktop is designed to quickly and easily connect employees with information that resides on their desktops and local-area networks. Easy to deploy and maintain, ISYS:desktop supports more than 30 foreign languages and 140 file formats.
desktop search, search software, search engine, enterprise search, text retrieval, information retrieval,