Sublime Web Inspector - Sublime Web Inspector enables users to debug Javascript right in the Sublime Text editor.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Error Prone - Error Prone is a bug detection tool for Java code, integrated into the Java compiler.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
netquery - netquery is the system introspection tool.
Postman - The Collaboration Platform for API Development