I think OP should make it more research, means separate the list between trust and bad one.
I'm too skeptic using stranger service, especially mixing service, but since I see bitmixer I have no doubt with their service.

I found one, bitcoin fog: https://bitcointalk.org/index.php?topic=50037.0 but looks like this service is have red flag.
If OP just want listing service, better to make separate category.