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A framework used by penetration testers for building custom exploits for infiltrating systems. Written in Ruby. Comes with a large library of payloads and other nifty and fascinating tools. It's worth learning to use if you're serious about penetration testing or exploit development. Also, the cutting edge of attack technologies winds up coming out of the Metasploit project.
A list of all of the interrupts in the 32-bit x86 CPU architecture. Deep magick lies beyond this link...
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Someone fed ROM dumps from a couple of Atari games into distellamap and generated maps of function calls, with sprite dumps. Amazing, how simple games were back then...
Links to various and sundry assembly language related resources for Linux.
A disassembler for Windows. One of the best in the field, and v2.0 just went beta. It's shareware, though it doesn't appear to lack any functionality if you haven't purchased it yet.
A list of tricks and methods for optimizing code written for the ATmel microcontrollers using GNU GCC.
A wiki dedicated to the Commodore-64 home computer.
An online reference for Intel 32-bit assembly language opcodes and mnemonics.
An online reference for Intel 64-bit assembly language opcodes and mnemonics.
An open source modular macro assembler that supports a number of CPU architectures out of the box and makes it easy to add new ones.