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Both PostmarketOS (if you use the phosh env) and Mobian use phosh, proc, chatty, libhandy, squeekboard, and a number of Purism packages. Mobian would take a lot more work (and likely would not exist) if they did not take advantage of Purism's work.

Feel free to go through https://puri.sm/posts/ to see their documentation of what they contribute, but here is one post I choose arbitrarily:

https://puri.sm/posts/librem-5-may-2020-software-development... Note the "Linux Kernel" section.

Here's another one: https://puri.sm/posts/librem-5-june-2020-software-developmen... Also note the "Linux Kernel" section.

"Phosh is current available on 8 different mobile distros that have been ported to the PinePhone, and Phosh is the preferred DE on 7 of those 8."

https://amosbbatto.wordpress.com/2020/08/05/advantages-of-ph...

The list of those distros is in the link.

I think they upstreamed patches to gnome and wlroots