You can ship a fully signed and self-updating macOS app from Linux (or Windows) using my product Conveyor:

It has built in support for Electron, JVM, Flutter and even native apps (although of course then you still have to compile the native binaries on macOS yourself).

That also works the other way around. You can ship to Windows from Linux or macOS.

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henearkr 19 hours ago | parent [-]

No support for iOS though.

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mike_hearn 17 hours ago | parent [-]

Right, it's meant for portable desktop apps. You have to compile iOS apps on a Mac anyway so I'm not sure there'd be any demand for Conveyor's cross-building support for iOS apps.

	▲	henearkr 13 hours ago \| parent [-]
		"You have to compile iOS apps on a Mac anyway" Well, not if somebody finds a way to run the compilation elsewhere! Hence my comment! Right now, iOS dev requires to own a recent Mac machine, which is hell of expensive, and moreover needs to be renewed every few years... Completely unjustifiable...