Kriya
Babaji, Paramhamsa Yogananda, Sri Sri Ravi Shankar, Cyberspace Ashram for Kriya Yoga, Footsteps to Freedom, Jujersa Yogashram, Kriya Yoga Book, Kriya Yoga Institute, Kriya Yoga Meditation, Kriya Yoga of Babaji: Lahiri Mahasaya Lineage, Learn Kriya Yoga Online, Mangeshda Institute of Spiritual Awakening, Purna Kriya Yoga
Raja Yoga
Sri Swami Sivananda expounds on the philosophy of Yoga, the Sutras of Patanjali, and other aspects of Raja Yoga.
Raja Yoga of Shri Ramchadraji
Based on the philosophy and practice of Raja yoga as modified by Sri Ramchandraji Maharaj of Shajahanpur.
Sameeksha: Astanga Yoga
Provides brief history of Patanjali's eight-limbed path, along with information on asanas, pranayama, the teachings of Swami Vivekenanda, and many links to teachers and other resources.
Yoga For You
Outlines the origins of Yoga, and describes the eight parts of Astanga Yoga. Illustrations and technique for several asanas. Part of the Facets of India site.