Here are several links to useful websites.
BoardGameGeek
https://boardgamegeek.com
VaeVictis (french magazine)
https://www.vaevictismag.fr/fr
Consimworld
https://www.consimworld.com
Strategikon (french forum)
https://www.strategikon.info/phpBB3
Vassal Engine
Sekigahara 1600 : https://vassalengine.org/wiki/Module:Sekigahara_1600