I have tried Bitcoin Fog, BitBlender and Grams Helix but sending your coins to someone for mixing is always risky and Bitcoin Fog has been reported as spam by many people who lost their coins.
So, searching for an open source bitcoins tumbler I found “Joinmarket” which is awesome, its still in development and they are doing a very good job in trying to make it possible for everyone to make private transactions.
https://github.com/JoinMarket-Org/joinmarket >>github link for joinmarket
https://github.com/JoinMarket-Org/JoinMarket-Docs >>Technical documentation of Joinmarket
https://github.com/JoinMarket-Org/tailsjoin >> Scripts to setup and use JoinMarket on the TAILS OS
IRC: #joinmarket on irc.freenode.net https://webchat.freenode.net/?channels=%23joinmarket
Bitcointalk thread: https://bitcointalk.org/index.php?topic=919116.msg10096563
Subreddit: https://reddit.com/r/joinmarket
Twitter: https://twitter.com/joinmarket
And the best thing I found about joinmarket is their plugin for electrum wallet which makes the job fucking easier and it works perfectly as I have tried it before posting this.
https://github.com/AdamISZ/electrum-joinmarket-plugin
You just need to follow the below instructions:
1. pip install libnacl
2. git clone https://github.com/AdamISZ/joinmarket_core, then sudo python setup.py install it. Use Electrum’s Linux “easy” installation link: sudo pip install https://download.electrum.org/2.6.4/Electrum-2.6.4.tar.gz
Bugfix: apply the patch https://github.com/spesmilo/electrum/commit/59d39108823989966e27a2f5df24c296cf2c1187 to Electrum. This manual source edit is needed since we want to do testing off the release, but Electrum will simply fail to sign transactions without this bugfix. This can also be done by manually editing the /usr/local/lib/python2.7/dist-packages/electrum/wallet.py file and changing txin = tx.inputs[i] to txin = tx.inputs()[i].
3. git clone https://github.com/AdamISZ/electrum-joinmarket-plugin.git repo (or zip) and manually copy its subdirectory joinmarket into the installation: sudo cp -r joinmarket /usr/local/lib/python2.7/dist-packages/electrum_plugins/. (replace with whatever the location of dist-packages is for your environment).