Mathematik und Informatik
Differential and Integral Equations
De Gruyter Open: Book Series on Partial Differential Equations and Measure Theory (open access)
Journal of Evolution Equations
Partial Differential Equations and Applications
HCDTE Lecture Notes: First Volume and Second Volume available for free download.
Transport, Fluids, and Mixing: edited volume with Anna Mazzucato, published by De Gruyter Open, available for free download.