Proxomitron

jEdit is a mature programmer's text editor with hundreds (counting the time developing plugins) of person-years of development behind it. jEdit beats many expensive development tools for features and ease of use AND it is released as free software with full source code...

Formats USB drives to FAT, NTFS, exFAT, and more, while creating bootable USBs from diverse ISOs. Supports MS-DOS/FreeDOS with no external files and offers BIOS or UEFI mode, including bad block check. Ideal for systems lacking an OS or flashing BIOS and lightweight, ad-free.

Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).