A simple Project Management Software facilitates planning, organizing and scheduling tasks. A more complex project management software can provide tools for allocation of resources, tracking issues, cost or budget management, customer support and sales analysis. There are all sorts of project management software available in the market to cater to the needs of an individual or a small to medium sized groups and business organizations.
Our Top 5 open source project management softwares are -
1. TeamLab

TeamLab is a very easy to use and feature rich online collaboration service.A quick snapshot of the dashboard will help you understand its simplicity.

Some of its Main Features are -
●Project Management - Build teams and assign tasks. Schedule project milestones, track project activity and generate reports.
●Business Collaboration - Create posts in blogs and forums, view employee details. Share photos, bookmarks and Wiki pages.
●Documanet Management - Create, edit, save and share documents directly on your portal. Import docs base from Google Docs, Zoho, Box.net. Integrate documents into your project module.
●Customer Relationship Management - Manage your customer relations directly on your portal. Use the multi-functional system to build efficient clients interaction.
●And Many more including Email Management, Mobile Version & Calendar.
They provide an very simple sign up process to get started which gives 1 GB of free space as well. See More
OR just download and install on your own server or machine.
2. Tree.io

As they say it, Tree.io is an all inclusive cloud based business management software.
Again a very clean and easy to use interface supporting many features including : -
●Project Management
●Service Support
●Sales Management
●Document Mangement
●Identity Management
●And Finance, Mobile, Messaging, Reports.
Check out the download section.
3. Project-Open
Project-Open is a very extensive system. It helps you to run your business by covering areas including CRM, sales, project planning, project tracking, project collaboration, time sheet management, financial management, invoicing and payments. With more than 1,000,000 lines of code it is one of the largest open-source web applications in the world. It is used by more than 3000 companies in more than 80 countries.
We will not recommended it for small or individual projects as its a complicated system.
There is a huge list of its features here. They also provide a demo on their site.
4. dotProject

dotProject is built using free open-source applications and is produced and maintained by a small, but dedicated group of volunteers. dotProject is programmed in PHP, and utilises MySQL for a backend database (although other databases such as Postgres could also be used).Recommended server platform includes Apache 1.3.27, PHP 4.2+, and MySQL. In the spirit of free, peer-reviewed, open source application development, we would also encourage you to use an operating system such as Linux, FreeBSD, or OpenBSD. However, additional operating systems such as Windows, Mac, and other flavours of unix are also supported.
5. LibrePlan

LibrePlan is a collaborative tool to plan, monitor and control projects and has a rich web interface which provides a desktop alike user experience. All the team members can take part in the planning and this makes possible to have a real-time planning .
LibrePlan is open source and you can download, install and customize it for free.
Some of the other open source project management software available that could not make it to top 5 are:-
Projectnet
Plandora
Redmine
web2project
xplanner
openproj
build-access-manage at dayaciptamandiri.com