Built-in database support for small sites.
MySQL (libz library required), PostgreSQL, mSQL, Solid, iODBC, unixODBC, EasySoft ODBC-ODBC bridge, Virtuoso, InterBase, Oracle (see the section called “Oracle notes”), SyBase, MS SQL, SAPDB SQL, DB2 (see the section called “IBM DB2 notes”) backends support.
HTTP support.
HTTP proxy support.
HTTPS support.
FTP support.
NNTP support (both news:// and nntp:// URL schemes).
HTDB virtual URL scheme support. One may build index and search through the big text fields/blobs of SQL database.
Mirroring features.
text/html and text/plain built-in support.
External parsers support for other document types.
Searching all of the word forms using ispell affixes and dictionaries
Basic authorization support. One may index password protected intranet HTTP servers.
Proxy authorization support.
Reentry capability. One may use several indexing and searching processes at the same time even on the same database. Multi-threaded indexing support.
Stop-list support.
<META NAME="robots" content="..."> and robots.txt support.
C language CGI, PHP3, Perl web front-ends.
Boolean query language support.
Fuzzy search: different word forms, synonyms, substrings.
Best matching documents are found first.
Various character sets support
HTML templates to easily customize search results.
Advanced search options like time limits, category limits etc.