Xmind - Xmind is a brainstorming and mind mapping application.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
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.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
Postman - The Collaboration Platform for API Development