Download the most recent stable release: myriad-0.2.0-incubating (Release Notes)
Once you have downloaded Myriad, follow the installation and configuration instructions, and take a look at the rest of the documentation.
The latest codebase can also be downloaded from the Apache git repository at: https://git-wip-us.apache.org/repos/asf/incubator-myriad.git
A read-only git repository is also mirrored on Github at: https://github.com/apache/incubator-myriad