Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users
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This strongly-typed, client library enables working with Elasticsearch. It is the official client maintained and supported by Elastic.
Solr client for .Net
Lunr-core is a small, full text search library for use in small applications. It's a .NET port of LUNR.js.
Smallest full text search engine (lucene replacement) built from scratch using inverted Roaring bitmap index, highly compact storage, operating in database and document modes