Xapian-core

Probabilistic text search database engine

Xapian is an Open Source Probabilistic Information Retrieval library, released under the GPL. It’s written in C++, with bindings to allow use from other languages.

Xapian is designed to be a highly adaptable toolkit to allow developers to easily add advanced indexing and search facilities to their own applications.

Xapian features include

• Ranked probabilistic search - word importance weighting
• Relevance feedback
• Phrase and proximity searching
• Full range of structured boolean search operators
• Term stemming
• Database files > 2GB
• Platform independent data formats
• Allows simultaneous update and searching.

WWW https//xapian.org/