By Nokome Bentley, Stencila, Aleksandra Pawlik, Stencila. Introduction by Raniere Silva, Software Sustainability Institute. In 2017, the Software Sustainability Institute organised the Docker Containers for Reproducible Research Workshop. Two years later, containers are more present today in research, powering many platforms where coding is being developed and executed. "Dockter: A container image builder for researchers" was originally published on opensource.com and is replicated here with permission from the authors.