Plebster could be a good choice but isn't open source. I don't use it for that reason but if that doesn't matter to you, it could be worth a look as well.
Discussion
I'm good with Amy hehe she's my girl
If it works for you, then stick with it for sure. I'm not bashing Amethyst, lots if people enjoy using it and it's arguably the most popular Android client available. It's just not usable for me and I can't recommend something I'm unable to use. That's all.