bifunctors
There are 4 repositories under bifunctors topic.
palatable/lambda
Functional patterns for Java
Risto-Stevcev/idris-functors
Bifunctors and functor products, coproducts, and composition
fwcd/curry-functors
Contravariant functors, bifunctors, profunctors and more for Curry
mtumilowicz/scala212-category-theory-either-bifunctor
Proof that Either could be seen as BiFunctor.