@eb948c00 Yea! I've personally found flecs to be really awesome so far, currently using it for all my core gameplay logic now (with Godot via GDExtension). There's lovely documentation (https://www.flecs.dev/flecs/) + blog posts about both ECS overall (https://github.com/SanderMertens/ecs-faq) + flecs specific stuff (https://ajmmertens.medium.com/). 

 @eb948c00 Currently developing with Flecs, I tried Entt a bit a 6 month back so I don't know any recent development, however, Flecs is mature and by far my favorite framework but there is a bit of a steep curve for creating a good workflow, it really force you into a functional paradigm and the filters (rule, query) are very powerful, they can be a bit hard to map mentally
Anyway, highly recommend!