Liberté, by Gretchen Angelo, is a first-year college French textbook with a true communicative approach. It has been adopted by instructors at over thirty colleges and high schools (partial list below). The textbook may be downloaded for free in accordance with the license, or printed copies can be ordered. Please contact me for information on printed copies or requests for audio. Note that audio is available only to institutions adopting the text; I am sorry, but I do not currently supply them to homeschoolers or individual learners, as I simply get too many requests and cannot answer them all.
This is an introductory text intended for a one-year introductory course of the type typically taken by biology majors, or for AP Physics 1 and 2. Algebra and trig are used, and there are optional calculus-based sections. My text for physical science and engineering majors is Simple Nature.