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Beagle   (Compare Project)

License: mit

Sphinx Search   (Compare Project)

Mostly written in C++

License: gpl

flexsearch.js   (Compare Project)

Mostly written in JavaScript

License: apache_2

Namazu   (Compare Project)

Mostly written in Perl

License: gpl

eZ Find   (Compare Project)

Mostly written in TypeScript

License: gpl

Manticore Search   (Compare Project)

Mostly written in C++

License: GNU-GPLv2

Apache Lucene.Net   (Compare Project)

Mostly written in C#

License: apache

Whoosh Python Search Library   (Compare Project)

License: bsd_2clause_ish

CSearch   (Compare Project)

License: gpl3_or_later

Lucene   (Compare Project)

Mostly written in Java

License: Unknown