Old KDE(3) had DCOP (which worked well within KDE3 in my experience), which is now superseeded by DBUS, which is (mostly) desktop agnostic. [0] https://en.wiki

Old KDE(3) had DCOP (which worked well within KDE3 in my experience), which is now superseeded by DBUS, which is (mostly) desktop agnostic. [0] https://en.wikipedia.org/wiki/Desktop_communication_protocol https://en.wikipedia.org/wiki/Desktop_communication_protocol There is also Vala from Gnome: [1] https://wiki.gnome.org/Projects/Vala/About https://wiki.gnome.org/Projects/Vala/About [2] https://gitlab.gnome.org/GNOME/vala https://gitlab.gnome.org/GNOME/vala