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"Reverse Engineering for Beginners" free book
Capstone disassembly/disassembler framework: Core (Arm, Arm64, M68K, Mips, PPC, Sparc, SystemZ, X86, X86_64, XCore) + bindings (Python, Java, Ocaml, PowerShell)
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, X86)
RT-Thread is an open source real-time operating system for embedded devices from China.
Keystone assembler framework: Core (Arm, Arm64, Hexagon, Mips, PowerPC, Sparc, SystemZ & X86) + bindings
Simple C compiler
Multi-architecture assembler for IDA Pro. Powered by Keystone Engine.
Educational MIPS simulator
Zero-dependency, reproducible build environments
Simple MIPS32 Emulator (primarily used to run SmallerC compiled for MIPS)
Toddler is a well-designed usable and portable microkernel OS
A processor cache simulator for the MIPS instruction set architecture