A bit dated...

We haven't been able to keep the open source ScrumDo up to date and it's fallen a few years behind.

You can find the full featured, commercial version at ScrumDo.com

ScrumDo

Online Scrum/Story Management Tool

ScrumDo is released under version 2.1 of the GNU LGPL.

ScrumDo-dev Google Group
The place to discuss development of the site.
Development Environment Set Up
Learn how to set up a development environment so you can modify ScrumDo
Developer Notes
Some notes to help orient developers.
Project Goals / Manifesto
The current vision of ScrumDo. We'll be using this as a guideline for directing the future of ScrumDo.
Extras Guide
How to create ScrumDo Extras that interface with external systems
Requested Help
Want to help, but don't know where to start? Here's a list of things we're looking for some help on.
Installing Scrumdo
How to install ScrumDo on your own server.
Data model diagrams
Diagram showing the different model classes in ScrumDo.

Find ScrumDo helpful? Want to help us offset our development and hosting fees?

Consider donating.

The best way is to get the project via GIT on GitHub:

git clone https://github.com/ScrumDoLLC/ScrumDo.git

Or you can download a packaged version of the master branch:

Online Scrum Tool