PUBLIC MARKS with tags search & "open source"

An open source, blazingly fast and hyper relevant search-engine that will improve your search experience.

"大規模なWeb検索向けの拡張性のあるフレームワークで、Lucene/Solrを土台に、WebページやPDFファイル、その他ドキュメント向けのパーサー、クローラー、リンクグラフ・データベースを付け加えた"

Hyper Estraier is a full-text search system.

Terrier is a highly flexible, efficient, effective, and robust search engine, readily deployable on large-scale collections of documents. Terrier implements state-of-the-art indexing and retrieval functionalities. Terrier provides an ideal platform for the rapid development of large-scale retrieval applications. The open source version of Terrier provides a comprehensive, flexible, robust, and transparent platform for research and experimentation in text retrieval. The research put into Terrier constantly expands towards new branches of the wider information retrieval field, making Terrier an ideal, strong, modular, and state-of-the-art platform for developing, assessing, and evaluating new concepts and ideas. Terrier is written in Java, and was used for Web and Enterprise search, Desktop, Intranet and Vertical search engines, as well as developing and evaluating novel large-scale text information retrieval techniques and applications.

Sphinx is a standalone search engine, meant to provide fast, size-efficient and relevant fulltext search functions to other applications. Sphinx was specially designed to integrate well with SQL databases and scripting languages. Currently built-in data sources support fetching data either via direct connection to MySQL or PostgreSQL, or using XML pipe mechanism (a pipe to indexer in special XML-based format which Sphinx recognizes).

Building a new open global search engine.

A collaborative Web Directory