nefuOS: A from-scratch OS with a browser, WebGL, and a local LLM — built in one month

A developer has successfully created nefuOS, a complete operating system built from scratch in just one month. The project features a custom kernel supporting both BIOS and UEFI, a proprietary browser with WebGL2 capabilities, a C++ compiler, and a package manager. Notably, the system includes NAI, a fine-tuned Qwen2.5-1.5B model capable of executing system-level tool calls. The developer authored approximately 120,000 lines of code manually, utilizing AI assistance for the remaining implementation details. Key technical challenges included developing a TLS 1.3 stack from scratch and implementing SWGL for software-based WebGL2 rendering without dedicated GPU drivers. The project, which includes over 100 built-in applications, is now available on GitHub. Future development plans focus on enhancing CSS support and integrating DeepSeek login functionality directly into the browser, marking a significant achievement in rapid, AI-assisted systems programming.