SageMath has two user modes :
With the notebook mode, you don't have to install SageMath on your computer : SageMath works in client mode (e.g. on Internet).
With SageMath, you can share and publish your computation sheets, figures and graphs with the notebook functionalities.
SageMath is mainly available in English. Part of its documentation has been translated in six other languages.
The French electronic book Calcul mathématique avec Sage (http://sagebook.gforge.inria.fr/) has been translated into German (https://members.loria.fr/PZimmermann/sagebook/CalculDeutsch.pdf) and English (http://sagebook.gforge.inria.fr/english.html).