docfmt bundles third-party work in its generated output. Their licences:

Astryx — https://github.com/facebook/astryx — MIT
  Copyright (c) Meta Platforms, Inc. and affiliates.
  Design TOKENS only (colour, radius, shadow, typography, motion), transpiled
  from light-dark() pairs into explicit light/dark blocks by scripts/tokens.mjs
  and emitted into src/render/tokens.ts. None of Astryx's React components or
  its compiled StyleX component CSS is used or redistributed. Some controls
  (DropdownMenu, PowerSearch) follow the interaction patterns Astryx documents,
  re-implemented here in plain DOM — no Astryx code is copied.

Mermaid — https://github.com/mermaid-js/mermaid — MIT
  Inlined into a generated dashboard only when the vault contains diagrams.

D3 — https://github.com/d3/d3 — ISC
  Inlined into a generated dashboard only when it declares a graph view.