The Consolations of Philosophy, Alain de Botton
Meditations, Marcus Aurelius
A Guide to the Good Life: the Ancient Art of Stoic Joy, William Irvine
Discourses, Epictetus
Enchiridion, Epictetus
Letters from a Stoic, Seneca
Analogues and Essays, Seneca
The Art of Living, Sharon Lebell (modern English interpretation of Epictetus' handbook)
Dhammapada
Plato's Podcasts, Mark Vernon
I to Myself, Henry David Thoreau
Essays, Michel de Montaigne
The Essential Epicurus
For the Love of Life, Erich Fromm
Just a few favorites. There's another I really like,but I can't "reccommend" it because in one chapter the author promotes homeopathy. (In Praise of Slow, Carl Honore).