The web platform challengedata.ens.fr includes the presentation of problems, and ensures exchanges of data and automatic evaluation of the results of participants. Lecturers can set up an account to select challenges adapted to their course and get access to a dashboard which monitors student activity during the course. The students can upload a report, which is downloadable by the pedagogical supervisor.
Have a look at the videos presenting the challenges: http://www.college-de-france.fr/site/stephane-mallat/Challenges-2020.htm
More information about Challenge Data (in French) here