Eucor
Eucor- The European Campus is a cross-border association of five French, German and Swiss universities in the Upper Rhine region. Students holding a student ID with the Eucor-Logo (new: from spring term 2017 onwards) can attend classes and use the libraries and other facilities at the universities in Basel, Freiburg, Strasbourg, Mulhouse/Colmar and Karlsruhe. Students who regularly attend classes at a Eucor-affiliated university during the semester receive a commuting allowance.
Find more information here.