Yes, the Freedreno work is a really good start, and an admirable one at that which has reached fruition!
I think there's quite a lot of closed userspace drivers that need (or would benefit from being) freed - I don't have a list to hand, but a quick look inside the /vendor partition (and directory) of a recent phone will give an idea of the closed userspace drivers being shipped on devices.
https://en.wikipedia.org/wiki/Free_and_open-source_graphics_...
Are there other Qualcomm userspace drivers that need to be freed?