Supplementary notes on the ninety-nine Lessons are available here:
Additional Study Material by Fr. Symeon:
The Way of Christ and Practice of Medicine
The Old Testament Prophets and Divine Healing
The Teachings of St. Gregory Palamas on Knowing God by Experience
The Human Will and the Spiritual Life
Images of Paradise and Hell in the Orthodox Tradition
Hieromartyr Mitrophanes and the Chinese New Martyrs of the Boxer Rebellion
St. Nicholas of Japan and the Samurai
Paradosis Pavilion Youtube Channel
Prayers
Orthodox Prayers of the Antiochian Orthodox Archdiocese of North America
Daily Readings, Saints, and Services of the Antiochian Orthodox Archdiocese of North America
The Great Canon (Canon of St. Andrew of Crete)
Akathist to the Nativity of Christ
Writings from the Early Church:
Holy Scripture: The Old Testament (The Greek Septuagint text)
Holy Scripture: The New Testament (Search NKJV and RSV translations)
The Didiche (also called The Teaching of the Twelves Apostles to the Nations)
Writings of the Early Church Fathers (ANE / NPNF series)
Address to Young Men on the Right Use of Greek Literature by St. Basil the Great
An Address on Vainglory and the Right Way for Parents to Bring Up Their Children by St. John Chrysostom
Additional Writings by other authors:
Which Came First?: The Church of the New Testament by Fr. James Bernstein
The Orthodox Faith by Protopresbyter Thomas Hopko
Bible, Church, Tradition: An Eastern Orthodox View by Fr. Georges Florovsky
Synodality and Primacy During the First Millennium by the Joint International Commission for Theological Dialogue between the Roman Catholic Church and the Orthodox Church
The Papacy by Réné-Francois Guettée
Orthodoxy and Heterodoxy podcast by Fr. Andrew Damick
What Orthodox Christians Believe (Ancient Faith Publishing)
Orthodox Film
Ostrov (The Island)
Orthodoxy in Colonial America
Timeline of the Life of Philip Ludwell III, the first convert to Holy Orthodoxy in America
Education for Children & Parents
Saints in Times of Trouble Activity Book (including the story of the Hieromartyr Mitrophan of Beijing)
Saints Who Where Physicians and Healers Activity Book
Let Us Attend (Follows the Divine Liturgy Gospel Reading for each Sunday)