OpenUTM

Cross-platform, open source UTM alternative. Easy hypervisor for everybody to have a mini computer inside their computer.

Tech Stack

• Monorepo: Turborepo + Bun
• Frontends: Tauri (Rust) + Electron (Node.js) — both built with equal care, user chooses
• UI Framework: React + TypeScript
• Backend: Direct QEMU control via QMP
• Display: SPICE protocol
• Telemetry: none

Project Structure

openutm/
├── apps/
│   ├── tauri/          # Tauri desktop app (Rust backend)
│   └── electron/       # Electron desktop app (Node.js backend)
├── packages/
│   ├── ui/             # Shared React components
│   ├── vm-core/        # VM management logic
│   ├── qemu-lib/       # QEMU QMP abstraction
│   ├── shared-types/   # TypeScript type definitions
├── package.json        # Root workspace config
└── turbo.json          # Turborepo pipeline

Getting Started

Prerequisites

• Bun v1.0+
• Node.js 20+ (for development tooling)
• QEMU installed locally (auto-detected at runtime)

Installation

# Install dependencies
bun install

# Start development servers (all workspaces)
bun run dev

# Build all packages
bun run build

# Run linters
bun run lint

# Run tests
bun run test

# Run type checking
bun run typecheck

Turborepo Pipeline

• build: Builds all packages (respects dependencies)
• dev: Starts dev servers (persistent, no caching)
• lint: Runs linters across all packages
• test: Runs test suites
• typecheck: TypeScript type checking

Platform Strategy

Phase 1: macOS (HVF accelerator) Phase 2: Linux (KVM) Phase 3: Windows (WHPX)

References

• UTM
• Quickemu
• Tauri Docs
• QEMU QMP Docs

License

MIT