Geocontainers help you running geospatial web services or applications for testing, development, and production deployments. Based on Docker, they get you started faster building upon a strong foundation for development, testing, and production deployment. All containers and documentation is provided under permissive open source licenses.
Geocontainers was initiated by Daniel Nüst @ FOSS4G 2016, but only works if independent developers and projects contribute images to the repository of Dockerfiles.
Geocontainers are not replacing images provided by software projects, but provide a platform to collaborate on images when the software communities cannot maintain one. Time will tell if Geocontainers can become a one stop shop for container images in the geospatial domain.
Wiki page on Docker images at OSGeo: https://wiki.osgeo.org/wiki/DockerImages