Manticore search is described as 'Open source search server designed to be fast, scalable and with powerful and accurate full-text search capabilities derived from Sphinx search project' and is an app in the online services category. There are more than 25 alternatives to Manticore search for a variety of platforms, including Online / Web-based, Windows, Mac, Linux and Android. The best alternative is Google Search, which is free. Other great apps like Manticore search are Openverse, elasticsearch, Algolia and You.com.
Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and JSON APIs. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, and rich document handling.
Sphinx is a software search engine designed with indexing database content in mind. It currently supports MySQL, PostgreSQL, and ODBC-compliant databases as data sources natively. Other data sources can be indexed via pipe in a custom XML format.