Paul Bierman and David Montgomery are leading the Key Concepts in Geomorphology project, which features a community-supported textbook accompanied by Vignettes, a series of >100 stand-alone, illustrated online geomorphological case studies, and Imaging Earth's Surface, an online geomorphology image database with >1500 photos.
Bob Anderson's Little Book of Geomorphology is packed with clearly explained examples of his quantitative approach to geomorphology, and is freely available for download for educational purposes, provided that you let Bob know how you're using it, and point out any errors.
Bonneville Salt Flats and Pilot Peak
3 hours ago