I asked something similar earlier in Jambler ANN on Btt. I got an answer that there are partners who do not want to be exposed on the Jambler partner page.
I can understand why they replied like that, but there must be some unofficial list of all mixers that are using Jambler.
If I remember correctly that new mixer Tengricrypto used Jambler also.
Look for the Jambler.io PGP fingerprint in the letter of guarantee, if it is present. This mixer uses Jambler.io even if it is not mentioned, as all mixing operations go through the Jambler API.
Thanks.
I will check that out.
AFAIK there is a list of them here: https://mixhub.to/
I know about this website since they appeared inbitcointalk forum, but it looks like it's outdated for a while.
Maybe best way to find this out is by doing what hugeblack.