Add pwntools, pwndbg, and GEF

[zachriggle]

These three tools definitely belong on your list.

• Pwntools: Pwntools is a CTF framework and exploit development library. Written in Python, it is designed for rapid prototyping and development, and intended to make exploit writing as simple as possible (https://pwntools.com)
• Pwndbg: Pwndbg is a GDB plug-in that makes debugging with GDB suck less, with a focus on features needed by low-level software developers, hardware hackers, reverse-engineers and exploit developers. (https://pwndbg.com)
• GEF: GEF is a set of commands for x86/64, ARM, MIPS, PowerPC and SPARC to assist exploit developers and reverse-engineers when using old school GDB. It provides additional features to GDB using the Python API to assist during the process of dynamic analysis and exploit development. (https://github.com/hugsy/gef)