I also started making use of an unstoppable wallet recently after my thread on the technical board. A lot of members recommended it for use, and even the forum administrator is among those who recommend the use of the wallet. You can check out the coins that are supported by the unstoppable wallet here: . Coins Supported by Unstoppable Wallet
 
I also make use of the Metamask wallet. I don't know if they are open source, but it's been part of the oldest wallet I have been making use of in the past, and there is no problem. It has both desktop and mobile compatibility, but the desktop version has more features built into it than the mobile version.