The primary hub is the (Matrix Games / Slitherine), specifically the Command Ops 2 Mods and Scenarios section. Other sources:
where veteran players post map updates, unit icon overhauls, and historical scenario packs. The ProSim Forum command ops 2 mods
or community-run grognard servers often yields direct links to the latest fan-made content and "beta" mods. Notable Mod Types Icon & Graphic Overhauls The primary hub is the (Matrix Games /