Representative organoid systems based on droplet microfluidics. (A) Droplet microfluidic system for the formation of islet organoids. Reproduced from Liu et al. Copyright 2020, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. (B) The human pancreatic islet organoids in droplet-filled hydrogel fibers were created. Copyright 2021, ACS Publications. (C) Isolated liver portal mesenchyme and ductal cell organoids were coencapsulated into microgels based on droplet microfluidic. Copyright 2023, Cell Press. (D) Human brain assembloids were composed of cortical, hippocampal, and thalamic organoids by coding microcapsules based on droplet microfluidic. Copyright 2023, Wiley-VCH GmbH [61,69,70].