Postscript interpreter (Postscript
plugin)
Keyphrase extraction program
PDF converter
(PDF plugin)
RTF converter for
(RTF plugin)
Detect languages and encodings
Word converter
(Word plugin)
Excel/Powerpoint converter
(plugins)
Parses XML documents
Creates compressed full-text
indexes and performs searches
Database used for metadata
etc
Downloading
pages from the Web when
creating collections
Client and
server implementation of
Z39.50
English
language stemmer
Alternative
full-text indexer
C/C++ compiler
Version control system
Used for plugins etc
Web server