The open source version of Zotonic can be downloaded from Google code. We use the version control system Git.
Get the latest release
Download the latest release of Zotonic from Github as a .zip file.
The latest release of Zotonic is release 0.13.5. Read the release notes.
To run the latest-and-greatest development version of Zotonic, you can check out your own local copy of the Zotonic repository with:
git clone git://github.com/zotonic/zotonic.git
This will make a complete copy of the "master" branch of the Zotonic repository. Github provides a nice browsable overview of Zotonic's source code and the change logs.
Please check the installation guide for required third party software, build process and configuration.