This paragraph states all Javaslang collections are based on java.lang.Iterable and the source confirms. This seems like a good starting point to me.
Also javaslang.Value seems to have a lot of conversion methods from JavaSlang to JDK types. It also seems to be implemented by all main collection interfaces (Set, List, Map).
For Set and Map method ofAll(..) is defined on specific implementations of that interface, i.e. HashSet and HashMap.