I'm looking to find alternatives to Solr from the Apache Software Foundation.
For those that don't know, Solr is an enterprise search server. A client application uses a web-services like interface to submit documents for indexing and also to perform search queries. Solr has other features built in like caching and replication. I believe it was originally started by CNet and then open-sourced.
I'm looking for other search servers out there that might be seen as the competition.
1. Google. With over 86% of the search market share, one hardly needs to introduce readers to Google. However, it clearly needs to head up any list of search engines.
For private, truly non-Google search, try the venerable DuckDuckGo—which leverages hundreds of sources, including Bing and its own web crawler—or Searx, which can be customized to toggle search results on and off from more than 20 engines (including Google).
There are three main types of search engines, web crawlers, directories, and sponsored links. Search engines typically use a number of methods to collect and retrieve their results. These include: Crawler databases.
I wrote a long post about my experiences and features of all the engines I listed below but I scrapped it because formatting is a pita. But quite simply if you don't want to shell out money Solr/Lucene or Fast (now MSSE) is really about the best you can do.
Excluded because I have no experience of this product: Seamark,
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