  Teaching graph theory with the most adequate tools requires time and ideas.
We present how an open community of teachers shares contents and ideas on an
innovative platform. The objective is to get the students autonomous in their
training with activities that give them immediate feedback on their
understanding. Beyond learning, the very large collection of exercises of
various levels can also be used to evaluate the student's level. The proposed
activities can be algorithm's code in classical programming languages (e.g.
Java, Python) that the student can test with predefined tests proposed by the
teacher or collections of generated questions.
