====== Postman ======
Postman is a tool that help us to direct HTTP request. we used a lot.
====== ConEmu ======
ConEmu is a very good command console integration tool. you can use Windows CMD, git, Cygwin, Powershell etc there.
====== Cygwin ======
we use cygwin to simulate linux environment to use linux network commands.
====== Fiddler ======
we use fiddler to capture http request.
====== Wireshark ======
we use wireshark to capture other network traffic. e.g. SSL certificate handshake.
====== Other Online tool ======
  * dig over internet: http://tools.cloudxns.net/Index/Mdig
  * json-csv:https://json-csv.com/
  * 17ce:https://www.17ce.com/
  * ssl checker:https://www.digicert.com/help/  https://www.sslshopper.com/ssl-checker.html
  * host certificate test:https://globalsign.ssllabs.com/analyze.html
  * epoch time conversion: https://www.epochconverter.com/
  * azure media online player:http://ampdemo.azureedge.net/
  * IP 库：https://www.ipip.net/
  * Online network tools:https://network-tools.com/