Xapian is described as 'Open source probabilistic information retrieval library, released under the GNU General Public License (GPL). It full text search engine library for programmers. It is written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C#, Ruby, and' and is a Search Server in the development category. There are more than 25 alternatives to Xapian for a variety of platforms, including Linux, Web-based, Self-Hosted, Mac and Windows apps. The best Xapian alternative is Algolia. It's not free, so if you're looking for a free alternative, you could try Algolia or Elasticsearch. Other great apps like Xapian are Manticore search, Searchspring, Pagefind and Sphinx (search engine).
Expertrec custom search started as a replacement for google site search. It adds super-fast search autocomplete, spell correct, search listing pages to your website.
Qdrant (read: quadrant) is a vector similarity search engine and vector database. It provides a production-ready service with a convenient API to store, search, and manage points—vectors with an additional payload Qdrant is tailored to extended filtering support.
Search over millions of documents, and give to your users unique, amazing and unforgettable experiences.
SearchBlox is an out-of-the-box Enterprise Search Solution built on top of Apache Lucene/Solr. It is fast to deploy, easy to manage and available for both on-premise and cloud deployment.
Cludo is a powerful search solution to your website. It is built on top of Elasticsearch which means you do not have to do any further developing, or hire any developer concerning site search. Cludo's focus is to deliver an easy to use search engine with the greatest support...
Simplify how agents connect to enterprise data. Build high-impact AI apps with one centralized solution for agentic retrieval-augmented generation (RAG) workflows.
Enterprise search, simplified. Cloud-based enterprise search solution that search across all of your organization’s content sources — Aconex, Procore, Dropbox, Microsoft Sharepoint, Onedrive, and more.
Milvus is an open-source vector database built to power embedding similarity search and AI applications. Milvus makes unstructured data search more accessible, and provides a consistent user experience regardless of the deployment environment.
ParadeDB is a modern Elasticsearch alternative built on Postgres. Built for real-time, update-heavy workloads.
TinySearch is a lightweight, fast, full-text search engine. It is designed for static websites.
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