HACKING

Hacking links

Null Byte
Hack This Site
OverTheWire Wargames
Payloads All The Things
HackTricks (Pentesting Knowledge Base)
Hacker101
CTFtime (Capture The Flag events)
SecLists (Security Wordlists)

Rom Hacking links

ROMhacking.net
SMW Central
Metroid Construction
MAME (Emulator/ROM research)
Disassembled Pokémon Crystal (pret)
Data Crystal Wiki
NESDev Forum
Wuphax (Wii U hacking)

Retro software / Abandonware

My Abandonware
WinWorldPC
Internet Archive: Classic PC Games
Vetusware
cd.textfiles.com (Software CDs Archive)
ToastyTech GUI Gallery
Old-DOS.ru
PCjs (Emulated retro PCs)

Other links

textfiles.com
GeoCities Archive
Neocities Directory
Reddit: DataHoarder
SDF Public Access Unix
tildeverse (tilde communities)
90’s Design Archive
catonmat.net (Programmer’s blog)