Changes to the FoE-Helper - posted by mainline (Main Developer) on their Discord (IMPORTANT!) : r/forgeofempires
FoE How to Use the GB Investment Calculator - YouTube
FoE-Info
GitHub - foe-mmr/FOE-CLI-GB-COST-CALCULATOR: CLI tool written in Python that will help you to "help" others level their GBs in browser game Forge of Empires.