Daisy is a comprehensive content management application framework, consisting of a standalone repository server accessible through HTTP/XML (using the ReST style of WebServices) and/or a high-level (remote) Java API, and an extensive browsing and editing DaisyWiki application running inside Apache Cocoon.

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Developer: outerthought.org
License: Apache License
Operating System: OS Independent (Written in an interpreted language)

Hippo CMS is an open source information centered content management system.

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Developer: Tjeerd Brenninkmeijer
License: Apache Software License
Operating System: Unix, Windows

Innovative webbased Content Management System (CMS) genuinely focused on flexibility, usability, standards compliance, modern PHP5 coding practice (ala ruby on rails).

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Developer: Sigurd Magnusson
License: BSD License
Operating System: windows, linux, mac os x

Open Source Meta Search Engine - Free Meta Search Engine
This is a search engine that queries simultaneously a few search engines and collates their top results in a final result set.

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Developer: chalipa.org
License: GNU General Public License (GPL)
Operating System: Not Available

JobHut 1.

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Developer: JobHut
License: GNU General Public License (GPL)
Operating System: All

Ants is a free, web-based and open source Applicant tracking system based on Mantis* and t is released under the terms of the GNU General Public License (GPL).

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Developer: ATS
License: GNU General Public License (GPL)
Operating System: All

Open Classifieds, is a free open source script for classifieds, advertisement or listings.

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Developer: Open
License: GNU General Public License (GPL)
Operating System: Linux