Exploit Database - Exploits for Penetration Testers, Researchers, and Ethical Hackers (exploit-db.com) #
HackTricks #
GTFOBins #
If you are looking for Windows binaries you should visit LOLBAS. #
LOLBAS #
The goal of the LOLBAS project is to document every binary, script, and library that can be used for Living Off The Land techniques. [Windows]
Static Binaries #
Contains a bunch of statically-linked binaries of various tools, along with the Dockerfiles / other build scripts that can be used to build them. I generally just create these as I need them - not all tools are available for every platform or architecture.