Useful open-source tools with demos, tests, and clear maintainer notes.

Particle system editor for luminous nebula presets, JSON imports, and PNG stills.

Orbital ribbon composer for animated kinetic line systems and reusable motion presets.

Flow-field particle lab for animated chromatic vector fields and seeded studies.

Generates deterministic JSON fixtures directly from JSON Schema contracts.

Validates .env files against a small readable contract with CI-friendly strict mode.

Checks Markdown heading anchors and local links before broken docs hit main.

Scores GitHub issue signals before starting bounty or contribution work.

Small regression examples with tests, typechecking, and audit checks.

Standard-library fixtures for parsing, dates, retries, and edge cases.

Contribution scorecard and small-patch operating guide.

Reusable PR, clarification, review, and payout-privacy templates.

Preflight docs and worktree checks for focused OSS contributions.