JS:
https://github.com/virushuo/mixin-node
https://github.com/wangshijun/mixin-node-client

Currently, there are 14 open-source projects to be the reference for all developers:
Erlang
Sample1: https://github.com/wenewzhang/wk_bot
Go lang:
Sample 2: https://github.com/crossle/hacker-news-mixin-bot
Sample 3: https://github.com/crossle/bishijie-news-mixin-bot
Sample 4: https://github.com/crossle/imeos-news-mixin-bot
Java:
Sample 5: https://github.com/qige-one/mixin_java_sdk
JS:
Sample 6: https://github.com/virushuo/mixin-node
Sample 7: https://github.com/wangshijun/mixin-node-client
PHP:
Sample 8: https://github.com/ExinOne/mixin-sdk-php
Python2.x
Sample 9: https://github.com/myrual/mixin_client_demo
Sample 10: https://github.com/myrual/opensource_cnb_atm
Sample 11: https://github.com/myrual/mixin_network_api_example
Python3.x
Sample 12: https://github.com/includeleec/mixin-python3-sdk
Sample 13: https://github.com/albertschr/Mixin_EOS_P1_Player/tree/master/Python
Ruby:
Sample 14: https://github.com/an-lee/mixin_bot