UDE BioSLiDES would never have been possible without the support of a whole range of individuals and institutions. Our thanks go in particular to:

• The Faculty of Biology at the University of Duisburg-Essen (UDE), which made scanning the specimens possible by means of start-up funding.
• The developers of the software packages that form the basis for the UDE BioSLiDES software, in particular OpenSeadragon and Annotorious.
• The OER team of the University of Duisburg-Essen for their support regarding Open Educational Resources and for funding the annotation.
• Isabell Lazar and Eileen Winkendick for annotating the preparations.
• Ken Dreger for his support in setting up the server, and the team of the Centre for Information and Media Services of the UDE (ZIM), especially Sascha Sczyrba.
• The members of the Microscopy Forum (https://www.mikroskopie-forum.de) for their suggestions.
• As well as all persons who provided slides, in particular Rainer Teubner and Jörg Weiß (http://www.mikroskopie-bonn.de).