Apache Lucene is an open source and free text search engine library written in Java. It is a technology suitable for applications that requires full-text search, and is available cross-platform.
For the latest information on pricing, visit https://lucene.apache.org/core/downloads.html
A free and open source product.
The following is a quick overview of editions offered by other software in similar categories
Elasticsearch is an enterprise search tool from Elastic in Mountain View, California.
Azure AI Search (formerly Azure Cognitive Search) is enterprise search as a service, from Microsoft.
Enterprise AI Search, Intranet, and Wiki in one platform. Guru lives in tools organizations already use, so no need to context switch. Users can find info across any app, have an expert help if the info can't be found, and let Guru proactively identify knowledge gaps, duplicate knowledge, and…
Cost effective Opensource and easily customizable Active community and feedback … small scale applications it is a no brainer, Lucene is the best and most cost effective solution. Learning curve is not too steep either.
