Installing Alignak is documented in the official documentation.
All the Alignak ecosystem applications and modules exist in separate stable and develop repositories. The
stable repositories only contains versions that are robust and intensively tested.
develop repositories contain all the other versions including all the new features. A branch-named version is made available as soon as a build is running in the project Continuous Integration and a develop version is made available as soon as the develop branch is updated.
sudo apt install alignak
sudo yum install alignak
Note that it exists an alternate packaging for Fedora that allows a fine-grained installation of the Alignak framework. See this page.
sudo pip install alignak