Gnunet is GNU's internet alternative.

https://gnunet.org/en/news/index.html

https://gitlab.com/gnunet-messenger/cadet-gtk

https://www.reddit.com/r/linux/comments/gnm3b0/current_state_of_my_gtk_based_gui_for_the_cadet/

https://docs.gnunet.org/handbook/gnunet.html#CADET-Subsystem

https://docs.gnunet.org/tutorial/gnunet-tutorial.html/

https://docs.gnunet.org/tutorial/gnunet-tutorial.html/index.html#Top

https://docs.gnunet.org/handbook/gnunet.html#GNUnet-Developer-Handbook

https://gnunet.org/en/architecture.html

https://gnunet.org/en/gnurl.html