Commentaries
The first known commentary on the book of Zohar, "Ketem Paz," was written by Rabbi Shimon Lavi of Libya.
Another important and influential commentary on Zohar, 22-volume "Or Yakar," was written by Rabbi Moshe Cordovero of the Tzfat (i.e. Safed) kabbalistic school in the 16th century.
The Vilna Gaon authored a commentary on the Zohar.
Rabbi Tzvi Hirsch of Ziditchov wrote a commentary on the Zohar entitled Ateres Tzvi.
A major commentary on the Zohar is the Sulam written by Rabbi Yehuda Ashlag.
A full translation of the Zohar into Hebrew was made by the late Rabbi Daniel Frish of Jerusalem under the title Masok MiDvash.
Read more about this topic: Zohar