Community content for Fighters Legacy — a free, open-licensed collection of aircraft, terrain, missions, audio, and AI scripts playable with no proprietary content required.
All assets are licensed under CC-BY 4.0. Contributions require a DCO sign-off.
| Directory | Contents |
|---|---|
aircraft/ |
glTF 2.0 models + TOML flight data |
terrain/ |
Heightmaps + surface class definitions |
missions/ |
YAML mission files |
audio/sfx/ |
CC0 OGG sound effects (procedurally synthesised, tools/sfxgen) |
audio/radio/ |
Radio voice lines — synthesised speech, see below |
audio/music/ |
Music tracks + data/playlist.toml — generated audio, see below |
ai/ |
Lua 5.4 AI behaviour scripts |
Automatic (recommended): On first run, the Fighters Legacy engine offers to download and install fl-base-pack automatically.
Manual: Download the latest release archive from the
Releases page and extract it into your
mods/ directory so the result is mods/fl-base-pack/manifest.toml.
New to the game? The engine's installation guide covers system requirements and first run.
Audio sfx (.ogg) and terrain assets need no build step — they are used directly by the engine.
Music tracks are stored as MIDI source files alongside a FluidSynth render script:
# Linux / macOS
bash audio/music/<name>-render.sh
# Windows — use WSL or Git BashThe rendered .ogg output is committed alongside the source .mid and render script.
See CONTRIBUTING.md for asset submission workflow, naming conventions, licensing requirements, and review criteria.
All assets in this repository are licensed under
Creative Commons Attribution 4.0 International (CC-BY 4.0) unless an
individual asset carries a <filename>.license sidecar declaring CC0-1.0, or is covered by a path
rule in REUSE.toml — as the generated audio in audio/radio/ and audio/music/ is,
at CC0-1.0.
Two things in this pack are model-generated, and nothing else is.
- The 42 radio voice lines in
audio/radio/are synthesised speech, not recorded actors — produced locally by piper, an open-weight text-to-speech model, from the script and pinned models inaudio/radio/SOURCES.md. - The six music tracks in
audio/music/are generated, not recorded performances — produced locally with ACE-Step 1.5, an open-weight text-to-music model, from the prompts and seeds inaudio/music/SOURCES.md.
Both are regenerable by anyone from what is recorded in this repository, and both are CC0 rather than the pack's CC-BY-4.0, because a generated work carries no copyright to assert.
Everything else is authored: the aircraft come from parametric mesh builders, the sound effects from a procedural synthesis script, and the missions, flight models and mission prose are written. The engine's AI content policy (decision record 2026-08-17) permits generated audio in a shipped pack under four conditions, and continues to rule out generated art, campaigns and story prose. This section exists because one of those conditions is that players are told in the product, rather than in a pull request they will never read.
The fl-base-pack name and the Fighters Legacy project are not affiliated with any commercial flight simulation product.