http://www.humanreligions.info/tags/secret_societies.html
Human Truth Foundation pages (9):
Counter-Cultural and Alternative New Religious Movements, in the following sections:
Religions Adapt and Change: 4. Continued Modern Adaptation: New Religious Movements
Why do People Join New Religious Movements?
Shamanism: 2. The Sociological Causes of the Rise of Modern Shamanism and Other Pagan NRMs
The New Age: 1.3. The Causes of the Rise of the New Age and other NRMs
Modern Paganism (Neopaganism): 2. The Causes of Modern Paganism and other NRMs
Not from the Human Truth Foundation, but still relevant (1):