NetEase Open Source Mirror Site: http://mirrors.163.com/
Alibaba Cloud Mirror Site: https://opsx.alibaba.com/mirror
python official website: https://www.python.org/
Ubuntu Chinese Community: http://wiki.ubuntu.org.cn/%E9%A6%96%E9%A1%B5
Programming language ranking: https://www.tiobe.com/tiobe-index/
Big data website:
http://spark.apache.org/
http://hadoop.apache.org/
Database, JAVE related:
https://www.jetbrains.com/
http://www.oracle.com/technetwork/java/javase/downloads/index.html
Turing Community: http://www.ituring.com.cn/#
IP Address Calculator: http://www.ab126.com/goju/1840.html