A tiny C header-only risc-v emulator.

Pelikan is Twitter's unified cache backend

A VM That is Dynamic and Fast

The first open-source DDoS protection system

A portable microkernel-based multiserver operating system written from scratch.

The core software distribution for the Inform 7 programming language.

TinySSH is small server (less than 100000 words of code)

Embeddable Linux Kernel Subset - Linux for 8086

A tiny, embeddable language implemented in ANSI C

Bootstrapping LISP in a Boot Sector

An 8-bit minicomputer with a fully custom architecture

3D CAD application

The final version of the AI designed keyboard layout

Firmware source and binaries for the RP2040-based Debug Probe accessory

Text mode window environment. A terminal emulator and multiplexer with mouse support, overlapped windows and networked clients. Text-mode equivalent of X11 server + VNC server

Use a raspberry pi pico (rp2040) as a logic analyzer and oscilloscope with sigrok

Phantom: Persistent Operating System

The “Quite OK Audio Format” for fast, lossy audio compression

By the Bluebook implementation of Smalltalk-80

PumpkinOS is a re-implementation of PalmOS.

x86 PC emulator that runs both natively and in the browser, via WebAssembly

Lizard is an efficient compressor with very fast decompression. It achieves compression ratio that is comparable to zip/zlib and zstd/brotli (at low and medium compression levels) at fast decompres…

Message-passing kernel + userspace

32-bit RISC-V CPU in ~800 lines of C89

Modern cryptography for PostgreSQL using libsodium.

progman.exe^H^H^H^H

MaraDNS: A small open-source DNS server

A comprehensive guide for Linux Network (Socket) programming

Including the SDK、HDK、Datasheet of RISC-V MCU CH32V307 and other relevant development materials

Neptune OS: A Windows NT personality for the seL4 microkernel