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"Reverse Engineering for Beginners" free book
An open-source x64/x32 debugger for windows.
Capstone disassembly/disassembler framework: Core (Arm, Arm64, M68K, Mips, PPC, Sparc, SystemZ, X86, X86_64, XCore) + bindings (Python, Java, Ocaml, PowerShell)
Lightweight Lua-based IDE for Lua with code completion, syntax highlighting, live coding, remote debugger, and code analyzer; supports Lua 5.1, 5.2, 5.3, LuaJIT and other Lua interpreters on Windows, OSX, and Linux
Complete x86/x64 JIT and Remote Assembler for C++
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, X86)
x86-64 assembler embedded in Python
A linux-based assembly REPL for x86, amd64, and armv7
Keystone assembler framework: Core (Arm, Arm64, Hexagon, Mips, PowerPC, Sparc, SystemZ & X86) + bindings
Fast and lightweight x86/x86-64 disassembler library.
Multi-architecture assembler for IDA Pro. Powered by Keystone Engine.
Database of a complete X86/X64 instruction set.