This may be better in a different forum thread, but I actually started by tweaking the icon to fit the GNOME icon guidelines, which differ from the macOS ones. Among other things, GNOME icons use a different pixel grid; they are rounded rectangles with a specific corner radius; and they don't use integral drop shadows. Gradients generally aren't used, but I stuck with the existing one for consistency. Also GNOME prefers rendering directly from SVG, but I don't know how the application is packaged, so I included PNG exports, as well.

Here's the basic GNOME icon (which is very similar to the previous/existing Linux icon):

JoplinIconGnome

Incidentally, the GNOME Contacts icon is styled like a notebook:

data_icons_hicolor_scalable_apps_org.gnome.Contacts

So I quick threw together version of the Joplin icon based on it:

JoplinIconGnome_alt

Here are all three side-by-side:
JoplinIconGnomedata_icons_hicolor_scalable_apps_org.gnome.ContactsJoplinIconGnome_alt

Obviously, the notebook version of the icon is more speculative, while the rounded rectangle is more conservative (based on the existing icon, just with the correct margins and corner radii).

Anyway, let me know what you think of these, too! (Even if this isn't strictly the correct forum thread for them...) The images embedded in this comment are actually all SVG already, so they're ready to edit, but the gnome-icons branch is here, and my pull request is here.

EDIT: Here are some screenshots of the GNOME icons in context in my dock:


To be clear, circular and oblong-rectangular icons are not uncommon in GNOME. Just the only one I have in my dock at the moment is Firefox. The Discord icon has slightly nonstandard corner radii, but it's barely noticable.

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