5 links
The Yoga Aphorisms of Patanjali
theosociety.org
An interpretation by W. Q. Judge, originally published in 1889, regarding the aphorisms on concentration and the essential nature of isolation. Includes the text of the aphorisms.
The Yoga Sutras of Patanjali
intratext.com
The Threads of Union translation by Bongiovanni. With concordances and word frequency lists.
The Yoga Sutras of Patanjali: The Book of the Spiritual Man
gutenberg.org
Etext at Project Gutenberg.
Yoga Sutras of Patanjali
reluctant-messenger.com
Reluctant Messenger of Science and Religion version translated by Chester Messenger.