dtSearchs own document filters highlight hits in popular file types (including emails & attachments)
API supports C++, Java, SQL, etc.
dtSearch "covers all data sources"--eWeek; "Lightening fast"--Redmond Mag.
dtSearch Engine for Linux (32-bit / 64-bit): add instant searching of terabytes of text (and file format support) to your application:
25+ fielded & full-text search options (supports hundreds of international languages)
File parsers/converters highlight hits in popular file types
Includes WYSIWYG hit-highlighted display of popular Web-based formats
C++ and Java API (programming required for use)
Package requires C++ or Java programming. Load balancing, backup, testing, and development servers in use after the 30-day evaluation period all count as additional servers for licensing purposes. Royalty-free (from $9,995) and royalty (from $2,500).