IT Development & R&D based in Tokyo, Japan

We develop and maintain a wide range of open-source tools and libraries, primarily in Go and increasingly in Rust, with a focus on cloud infrastructure, networking, cryptography, language runtimes, and system-level utilities — often with an emphasis on pure, dependency-free implementations (no CGO, no C, no FFI).

Project	Description	Stars
goro	PHP interpreter implemented in Go
usdpython	Apple's usdzconvert and USD-related tools
teamclaude	Multi-account Claude proxy with quota-based rotation
reflink	Reflink (copy-on-write) file copy in Go
squashfs	SquashFS read/write implementation in pure Go
magictls	Automatic PROXY, PROXYv2 and TLS support on TCP streams
cterm	Terminal emulator optimized for AI coding tools

Interpreters, shells, and runtime environments.

• goro - PHP interpreter implemented in Go
• goro-rs - PHP interpreter in Rust
• gsh - Go native shell replacement
• nodejs - Node.js factory and pool for Go

Tooling built around AI-assisted development.

• teamclaude - Multi-account Claude proxy with automatic quota-based rotation
• cterm - Terminal emulator optimized for AI coding tools
• mcprun - MCP server runner
• bnpm - Sandboxed package manager using Linux namespaces

A growing family of pure-Rust implementations — no C, no FFI, often no_std.

• argus - Web browser written in pure Rust (in-house engine, GUI + headless)
• kataan - High-performance JavaScript engine in pure Rust (interpreter, bytecode VM, x86-64 JIT)
• purecrypto - Pure-Rust crypto toolkit: classical & post-quantum, X.509, TLS/DTLS/QUIC
• rsurl - Pure-Rust curl — HTTP/1-3, FTP, SFTP, WebSocket, and many more protocols
• puressh - Pure-Rust SSH library and CLI suite (ssh/sftp/scp/sshd)
• compcol - 30+ compression/decompression codecs behind one uniform streaming API
• fstool - Build, inspect, convert, and repack disk images and filesystems
• univdreams - Universal decompiler + compiler (ELF, PE, Mach-O round-trip)
• cacrt - no_std curated CA root certificates by OpenSSL subject hash
• psl2 - Fast no_std Public Suffix List with built-in IDNA
• origami - Experimental first-principles protein folder (all-atom MD, GPU-accelerated via wgpu)
• fullrust - 100% Rust binaries

Building blocks for cloud-native applications and distributed systems.

• fleet - Fleet cloud system
• clouddb - Decentralized indexed database using LevelDB
• cloudhttp - Easy SSL HTTP server for AWS, GCP, etc.
• cloudinfo - Fetch info on current cloud environment
• seidan - 星団 server cluster project
• lambda - Lambda utilities

Low-level networking tools and protocol implementations.

• magictls - Auto PROXY/PROXYv2/TLS detection on TCP streams
• dns - Modular DNS tools
• pktkit - Zero-copy L2/L3 packet handling — virtual switches, NAT, DHCP, ARP, NDP
• slirp - SLiRP networking stack in Go
• pppoeproxy - Simple PPPoE client/server proxy
• smartremote - Transparent partial HTTP file access with caching and resume

Secure implementations for authentication, HSM, and post-quantum cryptography.

• hsm - Go support for Hardware Security Modules
• jwt - JWT tokens without external dependencies
• jwttool - Command-line JWT generation tool
• mldsa / slhdsa - Post-quantum signature schemes
• authenticode - Pure-Go Authenticode signing for Windows PE files (no CGO)
• tpmlib - TPM (Trusted Platform Module) support
• vncpasswd - VNC password encryption/decryption

Multi-chain wallet infrastructure, signing, and cryptographic primitives.

• libwallet - Multi-chain mobile wallet library with TSS — Ethereum, Bitcoin, Solana, NFTs
• modchain - Modular blockchain system
• tss-lib - Threshold signature scheme library
• ethrpc - Ethereum RPC client
• secp256k1 / edwards25519 - Elliptic curve primitives
• base58 / bech32m - Address encodings
• blindsig - Blind signatures

Pure Go implementations for various file system and archive formats.

• squashfs - SquashFS read/write implementation
• iso9660 - ISO9660 image reading and creation
• vfs - Virtual filesystem abstraction
• reflink - Copy-on-write file copy
• gobzip2 - Pure Go bzip2 compression/decompression with parallel support
• gzscan - Scanner for gzip files in disk images

Multimedia processing libraries, often pure Go with no CGO.

• avgo - AV library in Go
• ffprobe - FFprobe tools in Go
• hlsmaker - HLS stream creation
• goavif - AVIF codec in pure Go (no CGO)
• gowebp - Pure-Go WebP encoder (no CGO)
• static-opus - Statically linked libopus for Go
• static-portaudio - PortAudio static for Go
• mblur - ImageMagick's motionBlur ported to Go

Parsers and serializers for various data formats.

• pjson - Enhanced JSON with contexts and group resolution
• graphql - GraphQL query parser
• gopcre2 - Pure Go PCRE2 (Perl-compatible regex), no CGO
• gomailparse - Streaming MIME email parser for Go
• ini - Simple INI file handling
• csscolor - CSS color parser
• tpl - Template engine for Go

Tools for building multilingual applications.

• strftime - strftime with BCP 47 language tags
• strtotime - PHP-compatible strtotime() for Go (natural-language date parsing)
• gotz - Raw IANA timezone data with embedded tzdata
• lngdb - Language database for Go
• countrydb - Country database
• currencydb - Currency database
• flagemoji - Flag emoji utilities
• ibanlib - IBAN parsing and generation

Libraries for interacting with hardware devices.

• streamdeck - Elgato StreamDeck API
• hid - Pure Go HID driver (no CGO)
• pixoo64 - Pixoo64 LED display library
• intel-dcapd - Intel DCAP daemon

JavaScript/TypeScript libraries for web development.

• klbfw - KLB framework module for frontend code
• fyvue - Vue library for KLB systems
• react-klbfw-hooks - React hooks for KLB framework
• react-autoruby - Auto ruby tag generation for React
• i18next-klb-backend - i18next backend for KLB systems

Tools for 3D content and Apple's Universal Scene Description format.

• usdpython - Apple's usdzconvert and USD tools (our most starred Python repo!)

General-purpose Go libraries and tools.

• goupd - Auto updater for Go applications
• uhash - Multi-algorithm hashing tool
• unison - Coalescing duplicate function calls with generics and caching
• bitmap - Bitmap manipulation
• ringbuf - Ring buffer with readers
• weak - Weak reference map (Go 1.18+)
• textutil - Text processing (word wrapping, etc.)
• typutil - Type conversion utilities
• rndstr - Random string generation

Our 200+ repositories are predominantly written in:

• Go - Cloud infrastructure, networking, crypto, language runtimes, and utilities
• Rust - A growing pure-Rust ecosystem (browser, crypto, networking, SSH, compression)
• JavaScript/TypeScript - Frontend frameworks and React/Vue components
• C/C++ - Static library bindings and low-level tools
• Python - USD tools and analysis utilities

We welcome contributions! Each repository has its own contribution guidelines. Feel free to open issues or submit pull requests.

Tokyo, Japan