Calligra/Download
Stable
There is no stable release of Calligra yet, but stable versions of the application can be found in KOffice which is the predecessor of Calligra. For downloads of KOffice see the KOffice Download page.
Unstable
Usage of unstable version is not recommended by the Calligra team.
Mageia
Calligra is available from the official repositories of the Mageia Linux distribution.
OpenSUSE
Packages are available from the unstable playground repository.
Ubuntu
Ubuntu users can get a nightly build of Calligra with the Project Neon, you need to add ppa:neon/ppa to your sources list and install project-neon-calligra package.