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FlightGear

Open-source flight simulator with multiplayer

Game Servers ★ 815 stars Medium setup GPL-2.0

FlightGear is a free, open-source flight simulator featuring detailed aircraft and a global scenery database. It supports a multiplayer mode where pilots share airspace through community-hosted servers.

Official siteSource code

Key features

  • Realistic flight modeling
  • Global scenery database
  • Multiplayer airspace
  • Cross-platform

Strengths

  • Released under the GPL-2.0 license
  • Written in C++

Is FlightGear secure?

OSV.dev has no published security advisories for FlightGear'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.

FlightGear replaces

Self-hosted Microsoft Flight Simulator alternativesSelf-hosted X-Plane alternatives

Health badge

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

SelfHostIndex: 16 · at risk

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[![SelfHostIndex health score for FlightGear](https://selfhostindex.com/badge/flightgear-sim.svg)](https://selfhostindex.com/app/flightgear-sim/)
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<a href="https://selfhostindex.com/app/flightgear-sim/"><img src="https://selfhostindex.com/badge/flightgear-sim.svg" alt="SelfHostIndex health score for FlightGear"></a>
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   :alt: SelfHostIndex health score for FlightGear
   :target: https://selfhostindex.com/app/flightgear-sim/

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

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