You can get Crust from Github: https://github.com/crusttech.
You can get the upstream community edition Corteza at: https://github.com/cortezaproject.
To get detailed instructions on how to set up Crust, visit the documentation site. Please note that the instructions are written for Corteza, the upstream community edition (so, you would need to replace “Corteza” for “Crust”).
Alternatively, you might want to try out our online demo.