Summa is a fast modular and scalable search engine written in Java. Summa is characterized by: 
 <ul><li>Integrated search. Summa can simultaneously access a number of different data and data sources and expose it in a unified interface.</li><li>Modular design. The Summa search system consists of a set of independent modules, which makes it simple and easy to maintain and upgrade.</li><li>Scalable. Summa supports a distributed architecture and can be scaled up or down to handle any amount of data.</li><li>Open standards. Summa is based upon modern web technologies and standards, and don’t include any proprietary codes or elements.</li><li>Failure tolerant. If a single source of data or service should fail, Summa will continue without that specific source.</li></ul>

Summa is a fast modular and scalable search engine written in Java. Sports a flexible workflow system and incremental indexing and facetting. Summa is primarily developed by the State and University Library of Denmark.

Summa

Typesense is an open source, typo tolerant search engine that is optimized for instant sub-50ms searches, while providing an intuitive developer experience. 
 
Features: 
<ul>
<li>Typo Tolerance: Handles typographical errors elegantly, out-of-the-box.</li>
<li>Simple and Delightful: Simple to set-up, integrate with, operate and scale.</li>
<li>Blazing Fast: Built in C++. Meticulously architected from the ground-up for low-latency (&lt;50ms) instant searches.</li>
<li>Tunable Ranking: Easy to tailor your search results to perfection.</li>
<li>Sorting: Sort results based on a particular field at query time (helpful for features like "Sort by Price (asc)").</li>
<li>Faceting &amp; Filtering: Drill down and refine results.</li>
<li>Grouping &amp; Distinct: Group similar results together to show more variety.</li>
<li>Federated Search: Search across multiple collections (indices) in a single HTTP request.</li>
<li>Scoped API Keys: Generate API keys that only allow access to certain records, for multi-tenant applications.</li>
<li>Synonyms: Define words as equivalents of each other, so searching for a word will also return results for the synonyms defined.</li>
<li>Curation &amp; Merchandizing: Boost particular records to a fixed position in the search results, to feature them.</li>
<li>Raft-based Clustering: Setup a distributed cluster that is highly available.</li>
<li>Seamless Version Upgrades: As new versions of Typesense come out, upgrading is as simple as swapping out the binary and restarting Typesense.</li>
</ul>

Typesense is an open source, typo tolerant search engine that is optimized for instant sub-50ms searches, while providing an intuitive developer experience. 

Typesense - Fast, typo tolerant search engine for building delightful search experiences

Xapian is an Open Source Search Engine Library. It is written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C# and Ruby. Xapian is a highly adaptable toolkit which allows developers to easily add advanced indexing and search facilities to their own applications. It supports the Probabilistic Information Retrieval model and also supports a rich set of boolean query operators. 

 It supports boolean, phrase and proximity, wildcard and synonym search. It is capable to perform related search by suggest more terms to the query text. Faceted search is supported. It has built-in filters to extract the content from various file formats like HTML, PDF, OpenOffice/StarOffice and lot more. 

It also provides support to index data from the database like MySQL, PostgreSQL, LDAP etc.

Xapian is an Open Source Search Engine Library. It is written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C# and Ruby. Xapian is a highly adaptable toolkit which allows developers to easily add advanced indexing and search facilities to their own applications. It supports the Probabilistic Information Retrieval model and also supports a rich set of boolean query operators.

Xapian - Search Engine Library

Norconex HTTP Collector is a full-featured web crawler (or spider) that can manipulate and store collected data into a repositoriy of your choice (e.g. a search engine). It very flexible, powerful, easy to extend, and portable.

Norconex HTTP Collector - Enterprise Web Crawler

mnoGoSearch for UNIX consists of a command line indexer and a search program which can be run under Apache Web Server, or any other HTTP server supporting CGI interface. mnoGoSearch for Unix is distributed in sources and can be compiled with a number of databases, depending on user's choice. It is known to work on a wide variety of the modern Unix operating systems including Linux, FreeBSD, Mac OSX, Solaris and others.

mnoGoSearch

ASPseek is an Internet search engine software developed by SWsoft.ASPseek consists of an indexing robot, a search daemon, and a CGI search frontend. It can index as many as a few million URLs and search for words and phrases, use wildcards, and do a Boolean search. Search results can be limited to time period given, site or Web space (set of sites) and sorted by relevance (PageRank is used) or date. ASPseek is optimized for multiple sites (threaded index, async DNS lookups, grouping results by site, Web spaces), but can be used for searching one site as well. ASPseek can work with multiple languages/encodings at once (including multibyte encodings such as Chinese) due to Unicode storage mode. Other features include stopwords and ispell support, a charset and language guesser, HTML templates for search results, excerpts, and query words highlighting.

ASPseek is an Internet search engine software developed by SWsoft.ASPseek consists of an indexing robot, a search daemon, and a CGI search frontend. It can index as many as a few million URLs and search for words and phrases, use wildcards, and do a Boolean search. Search results can be limited to time period given, site or Web space (set of sites) and sorted by relevance (PageRank is used) or date.

ASPseek

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Summa

Typesense - Fast, typo tolerant search engine for building delightful search experiences

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