In this article, I have tried to write the top 5 open source project management software tools which opensource.com has been covered last year. The project management tool which is listed below is based on some unique features.
Lets we see the top 5 open source project management software tools

1. ProjectLibre
ProjectLibre is a project management software tool that is used as a desktop replacement for Microsoft Project. Marc O’Brien is a co-founder ProjecLibre. This tool runs on the Java Platform and also allows to run it on Linux, Ms. Window OS, and Mac OS. The feature whose make him enter top 5 open source project management tools are its support, resource allocation, task management, tracking, chart, etc. This project has been awarded "Best Of Open Source" by InfoWorld in 2013.

2. LibrePlan
LibrePlan is a free and open-source web-based project management tool that is used by the project manager and project management team in the organization. It is licensed under the Affero General Public License(AGPL) and written in Java language. The feature included in this open source project management tool is, it allows you to monitor, plan, control, and organize the task of the organization. Its core functionality based on planning, monitoring, and controlling.

3. OpenProject
OpenProject is a free and open-source project management tool that included multiple plugins and features and a very agility community. OpenProject licensed under GNU General Public License version 3 runs on Ruby on Rails, it was developed with the effort and collaborative contribution of a very agile open source community. OpenProject has been won the award of "Best Practice" in 2011 in open source competition of the Berlin Technology Foundation.

4. ]project-open[
]project-open[ is a great complete and powerful open source project management software tool. Frank Bergmann is a founder of this project management software tool. It supports various languages but the main language of this software is Perl. It support dual license means its basically open source but some module which released under a commercial license, therefore it is said as a mixed source model licensed. It can run on both Linux and Windows depends on a stack of open source packages.

5. Redmine
Redmine is also a free and open-source project management tool. It is a flexible web management application. It is released under the term of GNU General Publick Licence v2. Redmine is written Ruby on Rails framework. The feature included in this stuff is, it is flexible and access control, forums and wiki community, good time tracking, show chart aid visual representation, etc.