The University Physics textbook from OpenStax: https://openstax.org/ . The online textbook is free to access and you can download a pdf version for free (OpenStax is non-profit and relies on donations and hard copy sales).
Links to the online texts:
Volume 1 covers mechanics, sound, oscillations, and waves.
Volume 2 covers thermodynamics, electricity, and magnetism.
Volume 3 covers optics and modern physics.