IR systems

• Terrier
  Our very own high-performance IR system, written in Java.

• Cheshire
  A full-text information retrieval system developed at Berkeley.

• Glimpse
  A tool to search entire file systems.

• Harvest
  Harvest is an integrated set of tools to gather, extract, organize, search, cache, and replicate relevant information across the Internet.

• Information Retrieval Toolkit
  High performance software for IR research.

• Isearch
  Freely available software (from CNIDR) for full text and fielded searching.

• Jakarta Lucene
  A text search engine written entirely in Java.

• MG
  MG is a public domain indexing and retrieval system for text, images, and textual images.

• Okapi
  The famous Okapi system, developed at City University in London.

• Xapian
  A C++ library of an IR system, with bindings for Java, C, Perl and PHP.

• PLS
  A free retrieval system from AOL.

• Prise
  Z39.50/PRISE 2.0 consists of a minimal Z39.50-1995 UNIX (Solaris) client-server pair and prototype indexing and search engines (PRISE) developed by NIST.

• SMART
  This is the location of the famous IR test bed, SMART.