Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Six Degrees of Wikipedia - Find the shortest path between two subjects
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.
Intch - Professional networking app
Postman - The Collaboration Platform for API Development
Google Cloud Search - Search across all your company's content in G Suite.