Vigyan Bhairav Tantra is an ancient Sanskrit text, part of the Rudrayamala Tantra, and is a dialogue between the Hindu god Shiva and goddess Parvati. It presents 112 meditation techniques (called dharanas) that are intended to lead to enlightenment.
This text has been interpreted by many spiritual teachers, most notably Osho, who gave extensive commentaries making the techniques more accessible for modern readers.
The techniques are highly practical and experiential, suitable for different temperaments and mental states.