duties_of_the_heart_image

Duties of the Heart
by Rabbi Bahya ibn Pakuda

orchos_hatzaddikim

Orchos Tzaddikim
anonymous

cheshbon

Cheshbon Ha-Nefesh (Accounting of the Soul)
by Rabbi Menahem Mendel Leffin

(included free with riverton mussar membership)

strive_for_truth

Strive for Truth (Michtav me Eliyahu)

by Rabbi Eliyahu Dessler

Texts available online in English:

Tomer Devorah (The Palm Tree of Deborah) by Rabbi Moshe Cordavero
Shaarei Teshuvah (The Gates of Repentance) by Rabbi Yonah Gerondi
Mesilat Yesharim (The Path of the Just) by Rabbi Moshe Chaim Luzzatto
The Mussar Letter of the Vilna Gaon
Hilchot Deot by Moshe ben Maimon (Rambam; Maimonides)
Iggeret ha'Mussar (The Mussar Letter) of Rabbi Israel Salanter (trans. Rabbi Zvi Miller)
Healing of Middos - Anger (from the classic book - Orech Apayim)