The Unstoppable Wallet is being recommended quite often in recent times as a good and open-source multi-coin client. But the truth is, I have never heard anyone say they use it or that they have used it extensively for a longer period of time. I would love to see some feedback by those people. It's always just a recommendation, where Unstoppable Wallet gets proposed to someone, and that's it. I will try to install it later on on my phone just to see how it works.