The major ones that I know of are
Pix4D and
Autodesk Recap. Pix4D is quite accurate from what I understand, but also quite pricey. I've used ReCap a fair bit, and while it's free, they do limit you to only 50 photos per upload. If you try it out, it works best with Hero3+ photos, not screenshots from a GoPro video.
Autodesk has a 'labs' (beta) program called
Memento that I've had better luck than ReCap with. Not as limited on the number of photos you can upload if I remember correctly, and the meshes seem to be better.
That said, modelling landscaping is going to be difficult at best - it moves too much. What exactly about the landscaping are you trying to model?