відверто кажучи — frankly speaking, to be candid
власне кажучи — as a matter of fact, strictly speaking
загалом кажучи — generally speaking
інакше кажучи — in other words
не кажучи (вже) про — not to mention, to say nothing of
як (то) кажуть — as the saying goes
кажуть — they say, it is said
що й казати — it goes without saying, needless to say.