Sysdig!

Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is the de facto (and often de jure) standard across many industries and educational institutions.

tcpdump is a common packet analyzer that runs under the command line. It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached.

strace is a diagnostic, debugging and instructional userspace utility for Linux. It is used to monitor interactions between processes and the Linux kernel, which include system calls, signal deliveries, and changes of process state. The operation of strace is made possible by the kernel feature known as ptrace.

Instana is Dynamic APM for Microservice Management. Specifically built for agile devops teams, we monitor and correlate every aspect of your application tech-stack. As your teams integrate and deploy new code Instana continuously discovers, and continuously aligns with the changes. Customers using Instana benefit from real-time impact analysis, improved quality of service, and optimized workflows that keep their applications healthy.

AirSnare monitors network traffic for unfriendly MAC addresses and alerts you when a MAC address is found that isn't on the friendly list. AirSnare also monitor DHCP requests from clients.

Glsof is two separate utilities (Queries & FileMonitor) to the command line utility Lsof by Vic Abell. Both applications are written in Java. Another fundamental requirement is the command line Lsof that has to be installed on your system. Lsof is supported by most of the Unix/Linux systems including Mac Os X.