Free internet search engines software for linux

eSearch provides a Java-based search engine.
eSearch is a server side Java-based search engine which supplies basic search capabilities for Web use. Its basic capabilities can be extended to include intelligent agents and other expert-system behaviors.
Main features:
- Free and Open Source
- Written in Java, and therefore platform-independent
- Uses Lucene API for Text and Index operation.
- Supplies basic search capabilities comparable to other existing search engines, for both intranet and internet use.
- Allows the basic capabilities to be extended to include intelligent agents and other expert-system behaviours, with the end result of smarter searching than is possible with existing search engines.
- Scaleable to truly mind-boggling dimensions of collections and users.
- Can dynamically index multiple servers and sources simultaneously
- Have a powerful Developer kit that include eSearch TAG Library, Samples & Documentation.
- Powerful Administration Center that let you control all crawl & search operation in your enterprise.
- Extensible architecture. You can plug new component from third party.
- Can be easily integrated with any other Web Applications: i.e. ePortal, eContent, eForum, eFAQ, eHelpDesk.

The key to success for a web site is good search engine ranking. All of the major search engines use link popularity to determine how well a site will rank - so the more high quality, relevant links that lead to your site, the higher it will rank. LinkMachine makes it easy to get the links you need by helping you establish hundreds of quality, relevant link exchanges.
LinkMachine will help you:
- Climb to the top of the search engines
- Gain quality links to your site today
- Automate your link management
- Uncover exactly how to beat your top competitors
- Attract thousands more targeted visitors to your site
The most effective way to interest webmasters in linking to your site is by offering to exchange reciprocal links. This is a win-win situation - both of your web sites benefit from new targeted, relevant links.
LinkMachine project helps you build as large a reciprocal link program as youd like. Search engines see all of the new links pointing from other quality, relevant sites to your site, and increase your rank. Note that this is very different from using indiscriminate "link farms", which will give you no advantage with the search engines.
Google recently revealed the secrets of its search ranking technology by filing a patent application. What we found out is that Google values organic link building - link building that progresses naturally rather than appearing artificial. LinkMachine is the ideal tool for building link exchanges the way Google likes them.
LinkMachines InstantLinks system and link search tools allow you to grow your link exchanges gradually and gain links from many different sites. And with LinkMachines Alternate Profiles feature, you can easily benefit from having the links to your site use a diverse variety of anchor text.

Sethi Search Utility provides a simple command line utility to submit a search to Google, Yahoo!, or MSN.
Sethi Search Utility is a simple command line utility to submit a search to Google, Yahoo!, or MSN and show the (text) results on standard output. Support for several search engines is included.
Its currently in serious need of a re-write, especially to avoid scraping and become a good engine using the search APIs provided.
Enhancements:
- The Google configuration was updated.

DataparkSearch Engine is a web-based search engine released under the GNU General Public License, full-featured and designed to organize search within a web-site, group of web-sites, intranet or local system.
DataparkSearch consists of two parts. The first part is indexing mechanism (indexer). Indexer walks over html hypertext references and stores found words and new references into database. The second part is web CGI front-end to provide search using data collected by indexer.
Main features:
- Support for http, https, ftp, nntp and news URL schemes.
- htdb virtual URL scheme support for indexing SQL databases.
- text/html, text/xml, text/plain, audio/mpeg (MP3) and image/gif mime types built-in support.
- External parsers support for other document types.
- Ability to index multilingual sites using content negotiation.
- Searching all of the word forms using ispell affixes and dictionaries.
- Fuzzy searching based on acronyms and abbreviations.
- Stop-words, synonyms and acronyms lists.
- Boolean query language support.
- Neural network based Popularity Rank.
- Results sorting by relevancy, popularity rank, last modified time and by importance (a multiplication of relevancy and popularity rank).
- Various character sets support.
- Accent insensitive search.
- Phrases segmenting for Chinese, Japanese, Korean and Thai languages.
- mod_dpsearch - search module for Apache web server.
- Internationalized Domain Names support.
Enhancements:
- Tags and categories are now stored in the urlinfo table and can be set on a per-document basis.
- Support for crosswords has been implemented for cache dbmode.
- Automatic phrase search has been implemented for compound words.
- The full method of relevance calculation has been modified.
- Conditional operators can now be used in the variables section of the template.
- Storing documents in stored database has been fixed for non-default values of StoredFiles.
- The -f switch has been added for cached, search, and stored: use to run them in the foreground (dont daemonize).
- Several bugs were fixed.

PloneSearchBox project is a portlet integrating different search engines.
PloneSearchBox is a compoment for Plone. It allows users to access quickly to a search tool. The Search can be done on the entire site, the current section of the site, or directly in search engine like google.
A tool is installed on the root site : portal_searchbox. Through the ZMI it allows to change what are the search engines proposed. In the textarea enter a search engine per line. This must be formated like folowed :
engine_name;engine_url?search=%(text)s
Dont forget the semi colon. %(text)s is the pattern that will be replaced by the ressearched text. If there are several pattern, text will be the label of the input box in the generated form.
If what is between the parantheses is different of text, it will be taken as label for the input field.
In the search_tool engines list, add commented line with #.
Enhancements:
- Make Installation work with Plone 2.1
- Zope Security added in portal_searchbox
- When engine list is empty, the list is really deleted.

crapsearch project enhances privacy by polling targeted Web search engines with random search terms. It does not flood search engines, but can help disguise your real search habits and prevent the creation of meaningful search logs and user tracking.

It uses local dictionaries, personal favorite lists, and Web news as sources for random search terms. crapsearch also takes a little care to make differentiation from your real browser (and therefore real searches) difficult.