- [Jina](https://github.com/jina-ai/jina/) - Cloud-native neural search framework for any kind of data. `Apache-2.0``Python`
- [librengine](https://github.com/liameno/librengine) - Private web search engine. `GPL-3.0``C++`
- [Manticore Search](https://github.com/manticoresoftware/manticoresearch/) - Much faster alternative to Elasticsearch for full-text search and data analytics. Provides much lower response time for small, medium and big data. `GPL-2.0``Docker/C++`