# OpenGG: rebuilding Gearhead Garage from observed rules and data formats

> OpenGG reimplements Gearhead Garage: The Virtual Mechanic as a Godot and C# engine that loads cars, jobs, decals, sounds and scenes from a user's game folder. Its rules and interface follow observations of the running original, while its loaders parse data-file formats worked out from the original files.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/tymsky/OpenGG>
- Primary source: <https://github.com/tymsky/OpenGG/blob/ba557b1abbb1f2e6152f5ef6a6754f7d7478dffa/README.md>
- Catalog page: <https://awesomerea.org/resources/opengg-gearhead-garage-case/>
- Record JSON: <https://awesomerea.org/resources/opengg-gearhead-garage-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/opengg-gearhead-garage-case/index.md)

## Requirements & limits

- **Prerequisites:** Requires the user's Gearhead Garage installation to play the original content.
- **Prerequisites:** Building requires Godot 4.7.1 .NET, .NET SDK 8 and Node.js 22.18 or newer.
- **Scope:** Beta builds target Windows and Linux.
- **License:** GPL-3.0 license; bundled photographs are CC0 and fonts use the SIL Open Font License.

## Primary sources

1. <https://github.com/tymsky/OpenGG/blob/ba557b1abbb1f2e6152f5ef6a6754f7d7478dffa/README.md>
2. <https://github.com/tymsky/OpenGG/blob/ba557b1abbb1f2e6152f5ef6a6754f7d7478dffa/docs/ARCHITECTURE.md>

## More in Games

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- [OpenGromada: reconstructing the Sigma Games engine](https://awesomerea.org/resources/opengromada-case/index.md) · Case study
- [OpenGT4: reimplementing Gran Turismo 4 for Windows](https://awesomerea.org/resources/opengt4/index.md) · Case study
- [OpenGTA2: rebuilding GTA2 from its game files](https://awesomerea.org/resources/opengta2-case/index.md) · Case study
- [OpenGuimo: GUIMO gameplay reimplemented in Godot](https://awesomerea.org/resources/openguimo-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.