Everyone is called on to provide ideas for anti-pandemic tools and solutions until (Fri) 2020-03-20 12:00 CET, and also everyone is called on to work in the 48 hours afterwards to make these ideas a reality. As usual, hackathons focus on IT software and hardware. And as usual in hackathons, I expect most ideas and products to get a good start there and gather a team but not be quite finished after the hackathon, so work will likely continue.
Also, all the results will be open source. Also they provide a list of resources that were developed during similar hackathons that happened in Estonia and Poland already.
The website is in German, but my guess is that you can safely ignore the language barrier because this is a crisis and the old rules and expectations went out the window. So, read the website in Google Translate and provide your ideas in English in case you can’t write in German.