Well i think what do you mean is bitcoins mixing services, you can try cryptomixer.io , it is reliable, fast, trusted and high volume bitcoins mixing services and it is protect their costumers.
Please check on here
https://cryptomixer.io And for other info you can ask on cryptomixer official thread on here
https://bitcointalk.org/index.php?topic=1484009.0Additionally cryptomixer allows you to mix even small amount of coins as small as 0.001 btc per mixing session. I don't know if bitmixer also allows below 0.01 btc transaction so I want to mention this feature of cryptomixer.