reference
- lucene
Apache Lucene is a high-performance, full-featured text search engine library written in Java.
- Elasticsearch
Free and Open, Distributed, RESTful Search Engine
- meilisearch
⚡ A lightning-fast search engine that fits effortlessly into your apps, websites, and workflow 🔍
- Sphinx
Sphinx search server
- RediSearch
A query and indexing engine for Redis, providing secondary indexing, full-text search, and aggregations.
- Xunsearch
（中文名：迅搜）免费开源的中文搜索引擎，采用 C/C++ 编写 (基于 xapian 和 scws)，提供 PHP 的开发接口和丰富文档
- TNTSearch
A fully featured full text search engine written in PHP