Welcome to the collection of the current must-read open-access papers in the field of organs-on-chips that have become available in the second half of 2018. This quarterly editorial column will be compiled by Dr. Andries D. van der Meer, University of Twente, The Netherlands. Feel free to contact him with tips about open-access papers on organs-on-chips and microphysiological systems that you feel should be included in upcoming collections.