Community-Lab is an open, distributed infrastructure for researchers to experiment with Community Networks, that are large scale, self-organized and decentralized networks and services built and operated by citizens for citizens. The goal of Community-Lab is to advance research and empower society by understanding and removing obstacles for these networks and services. This article outlines Community-Lab’s aim, development, characteristics and infrastructure. This demonstration presents its current status of development and deployment, a sample decentralized experiment, and an invitation to the broader large-scale distributed computing research community to participate in the project through an open call.