Well, from what I understand, Freenet is a total darknet, with things like sites, email, discussion boards, and so on, whereas ORC is focused just on storage. In fact, ORC is riding on top of tor hidden services, which is also a total darknet.
Freenet is not a "total darknet". It is a key-value storage basically. You can have immutable or mutable keys for data, and with these two things you can implement chat, sites, email, whatever. Freenet email does not implement the same protocols the outworld email does, nor can it communicate with outside emails, but since you must access it through a special client (not through you normal email client) it works.
