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).
Appbase.io provides a supercharged Elasticsearch experience with a #nocode relevance control plane (or JS UI components or a declarative REST API) and out-of-the-box search/click analytics and insights.
Adds a customizable search box to your web pages and show fast, relevant results powered by Google Search. It is useful in the ways that is free, but has quite bad crawlers for YOUR website.
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