---
title: "Acknowledgements | Rigel CMS"
url: "https://rigelcms.dev/acknowledgements"
description: "The projects and maintainers behind Rigel CMS, including Phosphor Icons, Meta's Lexical, ProseMirror and the tools used by this website."
---

# Acknowledgements

Rigel CMS uses third-party software for editing and previewing website content. This page credits the projects used by the editor, this website and the shared authenticator. Components retain their upstream licenses.

## Phosphor Icons

Rigel's editor and this website use [Phosphor Icons](https://phosphoricons.com/), under the MIT license, copyright Phosphor Icons. The original notice is retained with the editor's icon assets.

## Lexical

Rigel's structured article blocks use [Lexical](https://github.com/facebook/lexical) and its code, history, link, list, rich-text and table packages. Lexical is MIT-licensed, copyright Meta Platforms, Inc. and affiliates.

## ProseMirror

The Markdown editor uses [ProseMirror](https://prosemirror.net/), including its commands, example setup, Markdown, model, list, state and view packages. These packages use the MIT license.

## Other CMS dependencies

-   [DOMPurify](https://github.com/cure53/DOMPurify), by Cure53 and contributors: HTML sanitization for rendered content and previews. Available under MPL-2.0 or Apache-2.0.
-   [markdown-it](https://github.com/markdown-it/markdown-it): Markdown parsing and rendering. MIT license.
-   [Svelte](https://svelte.dev/) and its [Vite plugin](https://github.com/sveltejs/vite-plugin-svelte): the editor interface and build integration. MIT licenses.
-   [Astro](https://astro.build/): website integration and static editor routes. MIT license.
-   [Vite](https://vite.dev/): development and bundling. MIT license.

## Website dependencies

This website uses [Astro and its MDX, Markdown, RSS and sitemap integrations](https://github.com/withastro/astro), plus [Tailwind CSS](https://tailwindcss.com/). The website and authenticator use [Hono](https://hono.dev/); the public MCP endpoint uses the [MCP TypeScript SDK](https://github.com/modelcontextprotocol/typescript-sdk). These projects use MIT licenses.

-   [Astro Search Plugin](https://github.com/freshjuice-dev/astro-search-plugin) and [Orama](https://github.com/oramasearch/orama): browser search, under Apache-2.0.
-   [Astro Icon](https://github.com/natemoo-re/astro-icon) and the [Iconify Phosphor collection](https://icon-sets.iconify.design/ph/): website icons, under MIT.
-   [table-saw](https://github.com/zachleat/table-saw): responsive tables, under MIT.
-   [astro-llms-md](https://github.com/tfmurad/astro-llms-md): Markdown mirrors, under MIT.
-   [Bicho JavaScript SDK](https://bicho.fyi/): authentication diagnostics, under Apache-2.0.

## Fonts and generated images

[General Sans](https://www.fontshare.com/fonts/general-sans) was designed by Frode Helland for the Indian Type Foundry and is distributed through Fontshare. We self-host it for this website and use it in generated preview cards. It is covered by the [ITF Free Font License](https://www.fontshare.com/licenses/itf-free-font-license), not an open-source font license.

-   [Satori](https://github.com/vercel/satori), by Vercel and contributors: layout for social preview cards. MPL-2.0 license.
-   [satori-html](https://github.com/natemoo-re/satori-html): HTML input for Satori. MIT license.
-   [resvg-js](https://github.com/yisibl/resvg-js): SVG rasterization for generated preview images. MPL-2.0 license.
-   [sharp](https://sharp.pixelplumbing.com/): image resizing and compositing. Apache-2.0 license.

## Development and verification

-   [TypeScript](https://www.typescriptlang.org/), by Microsoft and contributors: type checking. Apache-2.0 license.
-   [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped): Node.js and Markdown type definitions. MIT license.
-   [Vitest](https://vitest.dev/): CMS unit tests. MIT license.
-   [axe-core](https://github.com/dequelabs/axe-core), by Deque Systems and contributors: browser accessibility checks. MPL-2.0 license.
-   [Wrangler](https://github.com/cloudflare/workers-sdk), by Cloudflare and contributors: local Worker development and build tooling. Available under MIT or Apache-2.0.

Development also uses [Node.js](https://nodejs.org/) and [pnpm](https://pnpm.io/). GitHub provides repository and authorization services; Cloudflare provides hosting. These services are distinct from the third-party software licenses listed here.

## Optional media sources

The editor can connect to [Pexels](https://www.pexels.com/), [Pixabay](https://pixabay.com/) and [Unsplash](https://unsplash.com/) when configured. Their image licenses, attribution requirements and API terms are separate from Rigel's software license. Availability of an image in a provider search is not a blanket permission to reuse it.

## Licenses and notices

This page highlights the directly used projects and their roles. Their dependencies can carry additional licenses and notices. Each component retains its own copyright and license; acknowledgement does not replace the notices required when distributing software or assets. Follow the upstream projects for their full license texts.

Rigel CMS's Apache-2.0 license does not relicense third-party code, fonts or icons. Project names and trademarks belong to their respective owners. These acknowledgements do not imply affiliation or endorsement.