The Vishnu Purana is a primary sacred text of the Vaishnava branch of Hinduism, which today probably has more adherents than any other. It is one of the canonical Puranas, a branch of post-Vedic sacred literature which was first committed to writing during the first millennium of the common era.

SIDDHARTHA An Indian Tale by Hermann Hesse
This is the story of Buddha, however I felt that many yogis would find it relevant.

A SERIES OF LESSONS IN RAJA YOGA By YOGI RAMACHARAKA
"_When the soul sees itself as a Center surrounded by its circumference--when the Sun knows that it is a Sun, surrounded by its
whirling planets-then is it ready for the Wisdom and Power of the Masters_."

Translated into English Prose from the Original Sanskrit Text.

BY YOGI RAMACHARAKA.
THIS BOOK GIVES THE HIGHEST YOGI TEACHINGS REGARDING THE ABSOLUTE AND ITS MANIFESTATIONS.

A Collection of Verses Being One of the Canonical Books of the Buddhists. As a yogi I appreciate buddhist texts, which is why this book is added to free yoga books library.

This Upanishad desires its title from the opening words
Isa-vasya, "God-covered."  The use of Isa (Lord)--a more personal
name of the Supreme Being than Brahman, Atman or Self, the names
usually found in the Upanishads--constitutes one of its
peculiarities.   It forms the closing chapter of the Yajur-Veda,
known as Shukla (White).

Oneness of the Soul and God, and the value of both faith and
works as means of ultimate attainment are the leading themes of
this Upanishad.   The general teaching of the Upanishads is that
works alone, even the highest, can bring only temporary happiness
and must inevitably bind a man unless through them he gains
knowledge of his real Self.   To help him acquire this knowledge
is the aim of this and all Upanishads.

Katha-Upanishad

Peace Chant

May He (the Supreme Being) protect us both, teacher and taught.
May He be pleased with us. May we acquire strength.  May our
study bring us illumination.  May there be no enmity among us.

OM! PEACE! PEACE! PEACE!

Peace Pilgrim Her Life and Work in Her Own Words
Compiled by some of her friends.  Lovingly dedicated to all seekers.
Peace Pilgrim emodies many yogic values, which is why I include her.

The following is the text from a little booklet called "Steps Toward Inner Peace" by Peace Pilgrim. "Steps" is not copyrighted and you are welcome to reprint it in whole or part. Please enjoy what is here. I hope you find this material as inspirational as I have. Peace Pilgrim demonstrates yogic values, which is why she is included here.

VEDÂNTA-SÛTRAS

With the Commentary by

SAṄKARÂKÂRYA

translated by GEORGE THIBAUT

Part I

(Books of the East, Volume 34)

[1890]

VEDÂNTA-SÛTRAS

With the Commentary by

SAṄKARÂKÂRYA

translated by GEORGE THIBAUT

Part I

(Books of the East, Volume 34)

[1890]

VEDÂNTA-SÛTRAS

With the Commentary by

SAṄKARÂKÂRYA

translated by GEORGE THIBAUT

Part I

(Books of the East, Volume 34)

[1890]

VEDÂNTA-SÛTRAS

With the Commentary by

SAṄKARÂKÂRYA

translated by GEORGE THIBAUT

Part I

(Books of the East, Volume 34)

[1890]

AUTOBIOGRAPHY OF A YOGI - By Paramhansa Yogananda 
WITH A PREFACE BY - W. Y. Evans-Wentz, M.A., D.Litt., D.Sc.
DEDICATED TO THE MEMORY OF LUTHER BURBANK An American Saint

In the free yoga book you will read the first lecture in a seriec of lectures[FN#1: Delivered at the 32nd Anniversary of the Theosophical Society held at Benares, on Dec. 27th, 28th, 29th,and 30th, 1907.] are intended to give an outline of Yoga, in order to prepare the student to take up, for practical purposes, the Yoga sutras of Patanjali, the chief treatise on Yoga.  By Annie Bessant

In the free yoga book you will read the second lecture in a seriec of lectures[FN#1: Delivered at the 32nd Anniversary of the Theosophical Society held at Benares, on Dec. 27th, 28th, 29th,and 30th, 1907.] are intended to give an outline of Yoga, in order to prepare the student to take up, for practical purposes, the Yoga sutras of Patanjali, the chief treatise on Yoga.  By Annie Bessant

In the free yoga book you will read the third lecture in a seriec of lectures[FN#1: Delivered at the 32nd Anniversary of the Theosophical Society held at Benares, on Dec. 27th, 28th, 29th,and 30th, 1907.] are intended to give an outline of Yoga, in order to prepare the student to take up, for practical purposes, the Yoga sutras of Patanjali, the chief treatise on Yoga.  By Annie Bessant

The Ramayana by Romesh C. Dutt Tr. [1899]
This is an abridged verse translation of the two longest epic poems in world literature, the Ramayana and Mahabharata. This translation is surprisingly readable and very moving once you get used to the rhymed couplet format. This also serves as an ideal introduction to the sprawling plots of these epic tales.

The Mahabharata, by Romesh C. Dutt Tr. [1899]
This is an abridged verse translation of the two longest epic poems in world literature, the Mahabharata. This translation is surprisingly readable and very moving once you get used to the rhymed couplet format. This also serves as an ideal introduction to the sprawling plots of these epic tales.

The Devî Gita (Song of the Goddess)
Excerpt from the Srimad Devî Bhagavatam translated by Swami Vijnanananda (Hari Prasanna Chatterji) [1921]

This is an excerpt from a much larger work, the the Srimad Devî Bhagavatam, also available from sacred-texts. This self-contained text describes an incarnation of the Devi, the Goddess. She discourses on her nature, and how she wants to be worshipped, particularly with Yogic practices, meditation and rituals.

Free yoga book - Vedic Reader for Students by Arthur Anthony Macdonell

Free Yoga book - Yoga Mysticism by S. N. DASGUPTA, Ph.D.

A Complete Manual of THE ORIENTAL BREATHING PHILOSOPHY of Physical,
Mental, Psychic and Spiritual Development. By YOGI RAMACHARAKA

The Hatha Yoga Pradipika is a classical text describing Hatha Yoga. It is said to be the oldest surviving text on Hatha Yoga. Swami Swatmarama, a disciple of Swami Goraknath, wrote the text in the 15th century CE, drawing upon previous texts and his own experiences.

This is an early 20th century translation of the Yoga Sutras of Patanjali, one of the earliest and most important texts of Yoga. The translation and commentary are intended for general readers, so there is a minimum of technical language and apparatus.

The Bhagavad Gita is technically part of Book 6 of the Mahabharata, although it is known to be a later accretion to the saga, which stands on its own merits. It is a dialog between the God Krishna and the hero Arjuna, taking place in a timeless moment on the battlefield before the climactic struggle between good and evil. The Gita (which can be found in hotel bedstands throughout India) is a classic summary of the core beliefs of Hinduism. It has had a significant influence far beyond Hinduism. Ghandi was dedicated to reading the Gita. This copy of the Bhagavad Gita is a translation by the Gita Society, a 501c3 non-profit.