Geomagnetic disturbances resulting from space weather activity have the potential to disrupt or damage the bulk electric power system, but the severity is a hotly debated topic. Compared to other large scale contingency events on electric power systems, the impact of Geomagnetic Disturbances is a rare event. This means that little in the way of empirical data is available to quantify impacts or to guide policymakers or utilities in hardening systems against such events. We present PowerModelsGMD.jl, an open-source Julia toolbox within the PowerModels.jl ecosystem for analysis and optimal mitigation of such events. This talk will discuss the state of open-source software in this problem space, the software architecture of PowerModelsGMD.jl, how it can be applied to produce actionable results, and summarize remaining research gaps.