https://github.com/axnsan12/drf-yasg
Internally, we're using it since the inception, it works great.

Just trying to understand. djangorestframework tries to add support for OpenAPI schema generation for some time now
#6119
#6532

Wouldn't it be more efficient to make drf-yasg an official library and add necessary abstraction for it to reuse parts of DRF (IIRC, @axnsan12 had to copy and patch some DRF code to make it work).