The Low Energy Mission Planning Toolbox is designed to significantly reduce the resources and time spent on designing missions in multi-body gravitational environments. It provides a means for quickly planning low energy missions that take advantage of multi-body gravitational environments. The high-speed, efficient process will allow rapid comparison between low energy methods (e.g. ballistic lunar capture transfer trajectories) and their direct counterparts (e.g. Hohmann transfers). The tools leverage recent research on low energy mission design methods to produce algorithms that are stable, hold potential for automation in certain situations, and can be easily interfaced with the NASA open source mission planing tool GMAT.