Key features:

Support for http, https, ftp, nntp and news URL schemes. htdb virtual URL scheme for indexing SQL databases. Indexes text/html, text/xml, text/plain, audio/mpeg (MP3) and image/gif mime types natively. External parsers support for other document types, including Microsoft Word, Excel, RTF, PowerPoint, Adobe Acrobat PDF and Flash. Can index multilingual sites using content negotiation. Searching all of the word forms using ispell affixes and dictionaries. Synonym, acronym and abbreviation query expansion based on editable dictionaries, specified by language and charset. Stop-words, synonyms and acronyms lists. Options to query with all words, all words near to each others, any words, or Boolean queries. A subset of VQL (Verity Query Language) is supported. Popularity Rank ba