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Looks like the author is still active and looking for funding: https://github.com/TachibanaGeneralLaboratories/download-navi
But development seems to have stopped indeed. There is a fork, with new developers, that is actively being worked on: https://github.com/Davilarek/download-navi
Unfortunately alternative are closed source (ADM , IDM ) , I've heard that free download manager was open source but even if it's still , I won't recommend it because it was reported that it redirected Linux users to malicious links