Big Bend Conservancy
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It's not free, but backcountry navigator pro is definitely the best. You should look at Gaia GPS. I don't have any experience with it, but it's free and allows map downloading.
If anyone is interested I really liked using the app backcountry navigator pro. Very much worth the$10. Here's what I did for this trip. https://www.google.com/amp/s/hpka.net/2014/06/11/making-your-own-backcountry-maps-waypoints-and-route-and-using-them-on-your-phone/amp/?client=ms-android-verizon
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