https://www.jamstackthemes.dev https://www.jamstackthemes.dev has a similar list of Hugo themes but also has about 800 open source themes for all the other ssgs

https://www.jamstackthemes.dev https://www.jamstackthemes.dev has a similar list of Hugo themes but also has about 800 open source themes for all the other ssgs like Jekyll, Gatsby, Next etc