Yes, this website is a resource. I can’t say anything about the quality, but hopefully you found it great.
AP World History Resources from CFR Education
Freemanpedia is a comprehensive and 100% free guide.
Good for learning specific events and concepts in each unit. I think FREEMANPEDIA is a better resource than Heilmer.
I especially recommend AP World students to watch the “Around the AP World in 80 Days playlist just because of how amazing the quality is.
AP World: Modern — Freemanpedia
AROUND THE AP WORLD DAY 80: THE REVIEW BEGINS