The publication of the complete works of Heidegger in German, the Gesamtausgabe, was begun during Heidegger’s lifetime. He defined the order of publication and dictated that the principle of editing should be “ways not works.” The Gesamtausgabe is published by Vittorio Klostermann, Frankfurt am Main. Publication has not yet been completed.
A list of the Complete Works in German can be found here.
A guide to the English translations can be found here.