Query preprocessor for Java-based search engines (Querqy Core and Solr i...
Query Parser for REST
Another simple parser for advanced search query syntax.
Tree Search Language (TSL) is a wonderful search langauge.
Query builder for Postgres backed by SQL parser
Querqy for Elasticsearch
tutorial for building a query parser using Ruby, Parslet, and Elasticsearch
a parser and a builder to work with URI query string the right way in PHP
Easy expressive search queries for Elasticsearch