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Redmine

Redmine is an open-source web-based project management application. Written using the Ruby on Rails framework, it is cross-platform and cross-database and should run on most Unix, Linux, Mac and Windows systems.
Bitnami offers a hosted version for free on Google Cloud Platform.
Planio offers a paid hosted version.

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PlatformsWindows, Linux, Unix, Mac

TechnologyRuby on Rails

Gityes

SVNyes

Mercurialyes

Pros

Pro
Visually appealing and has high usability

Redmine's UI is very simple and easy to learn to use. It does not overwhelm users with many options and information at once.

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Pro
Built In Wiki

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Pro
Built in Integration for GIT, SVN, & CVS

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Pro
Free and open-source

Redmine is a free and open source tool.

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Pro
Plugins support

If there is additional features set you want you can find or write plugins to extend the ability.

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Cons

Con
No hosted solution

In order to use redmine you have to install it into your own server or computer where you also need to have Ruby installed first. While it's not extremely hard, it's not an easy feat for a beginner.

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