Open Access Agreement with American Institute of Physics Publishing (AIPP): covers open access publishing of all accepted articles by submitting corresponding Max Planck authors in AIP-owned subscription journals, unfortunately, the agreement does not cover OA Gold journals. Please contact the library for specifics.

Springer Nature and MPDL Services GmbH on behalf of Projekt DEAL: "SPRINGER NATURE AND GERMANY’S PROJEKT DEAL FINALISE WORLD’S LARGEST TRANSFORMATIVE OPEN ACCESS AGREEMENT"

Please check the MPDL OA Journal list for APC specifics. Springer Nature's portfolio and Scientific Reports will only start on Aug. 1st, 2020. Springer Open and BMC  journals will be handled differently
Press release MPG: https://www.mpg.de/14334431/springer-nature-and-germany-projekt-deal-finalise-largest-transformative-open-access-agreement

Kai Geschuhn (MPDL, Munich): What will it take to make OA the default in scholarly communication?
Kirsten (Local MPI library, Jena): Local library Open Access Services

For central OA agreements between the Max Planck Digital Library and publishers, please check their Open Access publishing page.