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Zero-K

Free open-source RTS with self-hostable multiplayer

Game Servers ★ 868 stars Hard setup GPL-2.0

Zero-K is a free, open-source real-time strategy game built on the Spring engine. It supports multiplayer through self-hostable game hosts and is fully open-source including its game logic.

Official siteSource code

Key features

  • Physics-based RTS
  • Self-hostable multiplayer
  • No unit micro tedium
  • Fully open-source

Pros & cons

Strengths

  • Deep strategy
  • Completely free

Trade-offs

  • High memory needs
  • Hosting requires Spring knowledge

Is Zero-K secure?

OSV.dev has no published security advisories for Zero-K'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.

Zero-K replaces

Self-hosted Supreme Commander alternatives

Health badge

Maintain Zero-K? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 77 · good

Markdown
[![SelfHostIndex health score for Zero-K](https://selfhostindex.com/badge/zero-k-note-spring.svg)](https://selfhostindex.com/app/zero-k-note-spring/)
HTML
<a href="https://selfhostindex.com/app/zero-k-note-spring/"><img src="https://selfhostindex.com/badge/zero-k-note-spring.svg" alt="SelfHostIndex health score for Zero-K"></a>
reStructuredText
.. image:: https://selfhostindex.com/badge/zero-k-note-spring.svg
   :alt: SelfHostIndex health score for Zero-K
   :target: https://selfhostindex.com/app/zero-k-note-spring/

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

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