Update: This is now available in your browser.
Double Bitcoin Mixer http://doublemixwcfx4wadeuvuygpxej5jpu7uleesh3yptopnbj5kshnlrid.onion/
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Use of any one mixer comes down to trust. Trust that the mixing is sound, that the mixer is not compromised, and that it's not a honeypot to begin with.
Using two chained mixers mitigates most of this risk. Odds of having two bad mixers is far lower than just one.
To this end, I've written a Python 3 library and CLI for
Privcoin,
Foxcoin, and
Bitmix. They can be used separately, like
pip3 install privcoin; privcoin mix --currency bitcoin --output_address 1aaaa...
,
pip3 install foxcoin; foxcoin mix --currency bitcoin --output_address 1aaaa...
, etc.
The improvement is using two mixers, together.
pip3 install doublemixer
doublemixer mix --currency bitcoin --output_address 1aaaa...
You may wish to run it with torsocks to route the traffic over Tor.
This is completely client side, so no need to trust a third party. Just be sure to review the code of privcoin-python, bitmix-python, and doublemixer-python before use. Absolutely no warranties expressed or implied, no liability on the author's behalf, etc.
Source code for doublemixer on GithubIn action:

I can also make a browser (still 100% client side) version of this, both clearnet and a .onion if there's interest.