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Forward & Graph Indices

Indri & Lemur

Lucene & Solr


A Comparison of Free Search Engine Software  Yiling Chen - The paper summarizes basic information of ten free search engine software packages:Alkaline 1.5, Fluid Dynamic, ht://Dig, Juggernautsearch 1.0.1, mnoGoSearch, Perlfect,RuterSearch, SWISH-E, Webinator 4.0, and Webglimpse 2.x.
Anserini  a toolkit for reproducible information retrieval research built on Lucene
Atire   - an efficient search engine.
CGrep: C Library to search over compressed texts  Paolo Ferragina, Alessandro Tommasi, Giovanni Manzini
Cheshire II Project   - The Cheshire II project is developing a next-generation online catalog and full-text information retrieval system using advanced IR techniques.
Estimating search engine index size variability: a 9-year longitudinal study  Antal van den Bosch, Toine Bogers, Maurice de Kunder
Galago   - a toolkit for experimenting with text search
Ivory  Jimmy Lin, Donald Metzler, et al - Ivory is a Hadoop toolkit for web-scale information retrieval research that features a retrieval engine based on Markov Random Fields. It is not a full-featured search engine, but rather a research software.
Macaw   - An Extensible Conversational Information Seeking Platform.
MG4J: Managing Gigabytes for Java  
Pilosa   - an open source, distributed bitmap index that dramatically accelerates queries across multiple, massive data sets.
Swish-E   - Swish-e is well suited for collections of a million documents or smaller.
Terrier   - Terrier is a highly flexible, efficient, and effective open source search engine, readily deployable on large-scale collections of documents.
Terrier was developed by members of the Information Retrieval Research Group, Department of Computing Science, at the University of Glasgow.
It supports standard TREC and CLEF test collections.
WhistlePig  William Morgan - A minimalistic real-time search engine
whoosh   - pure-Python search engine.
Wumpus   - An experimental search engine developed by Stefan Büttcher.
Zettair   - Zettair is a compact and fast text search engine designed and written by the Search Engine Group at RMIT University. Zettair allows you to index and search HTML (or TREC) collections.