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Xapian is a Search Engine Library, written in C++ with bindings for Perl, Python, PHP, Java, Tcl, C# and Ruby. Xapian allows you to easily add advanced indexing and search facilities to your applications. See www.xapian.org for more information.
Monad is intend to be a complete Desktop search engine for GNU/Linux systems.
it will be a pluginable system to support many text file formats like html, pdf and so on...
The application should take a directory and parse it recursively or not, and execute a given executor. The executors shuold be pluggable and rendered on the application's ui according to some strict rules.
The Fast Index Library is an open source C++ template library which is used to build full text indexes based on Boolean, vector, extended Boolean or probabilistic models.
Find files within other ZIP JAR WAR EAR files. Search recursively for file names or search strings. This Java based utility can save you time when you wonder in which jar or ear file a particular class is defined.
Clucened is a project to build a daemon around CLucene, which is a C++ implementation of the Lucene search engine. This is *not* the CLucene project, but is a separate project to write a generic daemon based on CLucene.
InfoSpace is an application which indexes and then allows you to search your personal information space, such as your email, your documents, your music, your videos, your Flickr account, your news feeds, the web pages you've visited and much more.