One of the largest pure-Rust sovereignty stacks in history.
The official COOLJAPAN Pure Rust Ecosystem — 900 crates, ~36M SLoC, zero C/FFI (in default) · Memory-safe by design. We are rebuilding the entire scientific, media, AI, semantic web, formal verification, and systems stack in pure Rust — so AI agents and critical software can run anywhere with full sovereignty.
- Total crates: 900+ (and growing daily)
- Total Rust SLoC: ~36 million (Mostly the same as Linux Kernel)
- Total Rust Files: 100,000+
- Passing tests: 400,000+
- Projects: 75+ production-grade libraries
- All projects: 100%
fail0+Clippy0enforced
| Category | Project | Description | Link |
|---|---|---|---|
| Scientific Computing | SciRS2 | Complete NumPy/SciPy/scikit-learn replacement (~3M SLoC) | → |
| Scientific Computing | OxiPhysics | Unified physics engine - Bullet/OpenFOAM/LAMMPS/CalculiX replacement | → |
| LLM | OxiBonsai | Pure Rust 1-Bit (Sub-2-Bit) LLM Inference Engine + IMAGEN for PrismML Bonsai Models | → |
| LLM | OxiLLaMa | Pure Rust LLM inference engine — the sovereign alternative to llama.cpp | → |
| GPU (CUDA) | OxiCUDA | NVIDIA CUDA Toolkit software stack with type-safe, memory-safe Rust code | → |
| Media & Computer Vision | OxiMedia | FFmpeg + OpenCV replacement (108 crates) (~3M SLoC) | → |
| Geospatial | OxiGeo | Pure Rust geospatial data processing engine — cloud-native, full CRS & format support | → |
| Deep Learning | ToRSh | PyTorch-compatible framework with native sharding | → |
| Semantic Web & AI Reasoning | OxiRS | Rust-native platform for Semantic Web, SPARQL 1.2, GraphQL, Digital Twin (Apache Jena replacement) | → |
| Scientific Computing | QuantRS2 | Full Quantum Computing Framework (QuantRS2) | → |
| Digital Humans | OxiHuman | Privacy-first parametric human body generator (WASM/WebGPU) | → |
| Digital Humans | OxiGAF | Gaussian avatar reconstruction from monocular video | → |
| Formal Verification | OxiLean | Memory-safe Interactive Theorem Prover (Lean 4 inspired) | → |
| Formal Verification | OxiZ | High-performance SMT solver (Z3 replacement) | → |
| Pure Rust Demo (EML) | Phop | Differentiable symbolic-discovery engine written entirely in pure Rust | → |
| Legal Technology | Legalis-RS (legalis) | Legal statute parser, analyzer & simulator (Legal DX) | → |
| Government Technology (GovTech) | OxigenAI | OxigenAI rebuilds the (Japan) Digital Agency's government AI legal system "GenAI", powered by Legalis-RS and OxiZ | → |
| XML | OxiXML | Pure Rust libraries of XSLT 3.0 / XQuery / XSD 1.1 / RELAX NG / Schematron / XMLDSig / XSL-FO / RDF 1.2 / Turtle / RDF-XML / JSON-LD / RDFa / SVG / canonicalization / SPARQL | → |
| Ephemeris | OxiEphemeris | A pure-Rust, clean-room astronomical ephemeris engine (esp. for Astrology) | → |
| Real-time Signal Processing | Kizzasi | Rust-native AGSP for continuous audio, sensor, robotics & video streams | → |
| ... | 60+ more projects | Full ecosystem overview at cooljapan.tech | — |
Full project list & latest releases → Ecosystem Overview
Independent write-ups about the COOLJAPAN Pure Rust ecosystem, updated monthly.
Curated by KitaSan — the first individual sponsor of the Apache Software Foundation and the founder of the Apache Newsletter (2003).
-
2026-05 — 1-Bit LLMs in Pure Rust — A field report from OxiBonsai v0.1.3 · Naz Quadri A hands-on field report: measured decode and prefill throughput across the CPU AVX-2 and CUDA backends on real hardware, read through the SIMD kernels and error model, and documented three defects. Assesses the source as senior-level human Rust, and notes that release count rather than commit count is the meaningful activity signal for this codebase.
-
2026-08 — Local Inference Engine: OxiBonsai · 4D Developer Community Introduces OxiBonsai as a pure Rust inference engine for PrismML's sub-2-bit Bonsai models, noting its OpenAI-compatible server API as a drop-in replacement for existing workflows, and its zero C/FFI construction on the COOLJAPAN ecosystem.
📚 Full archive → cooljapan.tech/articles
Written about COOLJAPAN? Open an issue at cool-japan/cool-japan/issues with the link, or email contact@cooljapan.tech — we'll feature it here.
- Tech Blog (official): blog.cooljapan.tech
- Medium (release announcements): kitasanio.medium.com
- LinkedIn: KitaSan -- LinkedIn Member since Feb. 29th, 2004
- Main Website: cooljapan.tech
- Star the repos you like
- Try the WASM demos
- Contribute (we welcome issues)
- Follow the blog for daily release updates
The Rust sovereignty stack is here.
No more C dependencies (in default). No more Python for science. No more cloud lock-in.
Built with ❤️ by COOLJAPAN OÜ / Estonia (KitaSan, a Rustacean in a rusty, poor village in Southeast Asia)
Made with pure Rust • All public • Always fail0 + Clippy0