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Languages & Communications

Business Communication for Success v. 1.0 by McLean (custom license) [Review]
Business Communication for Success v. 2.0 by McLean (custom license)
Communications Skills by Sitima, et al. (CC-BY-NC-SA)
Communication Skills for Personal and Professional Development: The Seven Challenges Approach by Rivers (CC-BY)
Communication Theory by Wikibooks (CC-BY-SA)
Communications by Boundless (CC-BY-SA)
Deutsch im Blick  by University of Texas (CC-BY-NC-ND) [Ancillaries]

Francais Interactif by University of Texas (CC-BY)

From Sound to Meaning: Hearing, Speech and Language by OpenLearn (CC-BY-NC-SA)
Hearing by OpenLearn (CC-BY-NC-SA)
How to Communicate as a Health Volunteer by The Cain Project in Engineering and Professional Communication (CC-BY)
How Language Works: The Cognitive Science of Linguistics by Gasser (GFDL)
How to Present with Twitter (and other channels) by Mitchell (CC-BY-NC-ND)
Key Skill Assessment: Communication by OpenLearn (CC-BY-NC-SA) [Review] [Accessibility]
Liberté: a first-year French textbook by Angelo (CC-BY-NC-SA)
Mandarin Chinese by Learn NC (CC-BY-NC-SA)
bullet-3 Mezhdu Nami by Comer, deBenedette, Perkins, and Smyslova (CC-BY-NC-ND) Ancillaries
Spanish  by Wikibooks (CC-BY-SA)
Spanish I by Wikiversity (CC-BY-SA) [Review]
bullet-3 Spanish II by Wikiversity (CC-BY-SA)

 

Disclaimer: College Open Textbooks has not yet vetted all of the open textbooks on this list for quality or accuracy of the content. However, peer reviews, as indicated by an asterisk (*) next to the book title, are available at The Reviews: Languages and Communications.
Accessibility reviews, as indicated by the number 1 next to the book title, are available at Accessibility reviews.
License Attributes:BY=Open w/ Attribution.  CC=Creative Commons license.  GFDL=GNU Free Documentation License.  GGPL=GNU General Public License.  NC=Non-Commercial.  ND=No Derivative Works.  PD=Public Domain.  SA=Share Alike.