Monero.
Discussion
There is (or was) an Amethyst clone that let you zap Monero. I forget the name of it and don't know if it still exists.
More importantly Vitor has said he would add Monero to Amethyst if the community would code it, which should be easy (100x easier than making that Garnet fork that used a built-in wallet)
Also check out monstr.land