K9s is CLI application that is designed to interact with Kubernetes clusters. The project is opensource (github: https://github.com/derailed/k9s) and it’s aim is to make it easier to navigate, observe and manage application deployed in Kubernetes.

BCC (https://github.com/iovisor/bcc) is a toolkit for creating efficient kernel tracing and manipulation programs, and includes several useful tools and examples. It makes use of extended BPF (Berkeley Packet Filters), formally known as eBPF, a new feature that was first added to Linux 3.15. Much of what BCC uses requires Linux 4.1 and above.

mkfile allows you to create files with arbitary sizes. This comes in handy if want to test file transfer speeds between two endpoints and you want use a file with an exact size.