"Technically, these are the differences: Libdill is idiomatic C. Whereas libmill takes Go's concurrency API and implements it in an almost identical manner in C

"Technically, these are the differences: Libdill is idiomatic C. Whereas libmill takes Go's concurrency API and implements it in an almost identical manner in C, libdill tries to provide the same functionality via a more C-like and POSIX-like API."