Apache Solr - Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and...
jQuery Mobile - jQuery Mobile
ItemsAPI - ItemsAPI is open source search API for creating mobile and web application
Sphinx (search engine) - Sphinx is a fulltext FLOSS search engine that provides text search functionality to client applications. Sphinx (search engine) - WikiMili, The Free Encyclopedia - WikiMili, The Free Encyclopedia
Elasticlunr - Lightweight full-text search engine in Javascript for browser search and offline search.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.