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Aleph One

Open-source engine for the Marathon trilogy with multiplayer

Game Engines & Frameworks ★ 813 stars Medium setup GPL-3.0

Aleph One is the open-source continuation of Bungie's Marathon 2 game engine. It supports network multiplayer games and can host self-hosted matches of the classic Marathon trilogy and community scenarios.

Official siteSource code

Key features

  • Open-source Marathon engine
  • Network multiplayer
  • Community scenario support
  • Cross-platform

Pros & cons

Strengths

  • Free Marathon trilogy
  • Active maintenance

Trade-offs

  • Older game style
  • Small multiplayer scene

Is Aleph One secure?

OSV.dev has no published security advisories for Aleph One's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Aleph One replaces

Self-hosted Marathon original alternatives

Health badge

Maintain Aleph One? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 81 · excellent

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[![SelfHostIndex health score for Aleph One](https://selfhostindex.com/badge/alephone.svg)](https://selfhostindex.com/app/alephone/)
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<a href="https://selfhostindex.com/app/alephone/"><img src="https://selfhostindex.com/badge/alephone.svg" alt="SelfHostIndex health score for Aleph One"></a>
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.. image:: https://selfhostindex.com/badge/alephone.svg
   :alt: SelfHostIndex health score for Aleph One
   :target: https://selfhostindex.com/app/alephone/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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