Some resources
Collection of steganography tools - helps with CTF challenges
BurpSuite Extension: A one-stop pen testing checklist and logger tool
List of awesome penetration testing resources, tools and other shiny things
PEASS - Privilege Escalation Awesome Scripts SUITE (with colors)
Linux enumeration tool for pentesting and CTFs with verbosity levels
Seatbelt is a C# project that performs a number of security oriented host-survey "safety checks" relevant from both offensive and defensive security perspectives.
Updog is a replacement for Python's SimpleHTTPServer. It allows uploading and downloading via HTTP/S, can set ad hoc SSL certificates and use http basic auth.
A little tool to play with Windows security
SharpUp is a C# port of various PowerUp functionality.
Vanquish is Kali Linux based Enumeration Orchestrator. Vanquish leverages the opensource enumeration tools on Kali to perform multiple active information gathering phases.
Simple forward and reverse shells that can be compiled and used on pen tests to avoid AV and used to get better access.