Wombat spotter Jonahss reporting in, thought I saw the page you were looking for at JQuerySF 

Disable 404 pages for Gatsby websites

404 handler for Lad and Koa (best used with koa-better-error-handler)

Create a 404 page for TypeDoc-generated doc.

Identity-preserving bridge to 404.directory Agent action risk preflight.

A UI component to display empty states, 404 pages, redirects, etc.

Scaffold a @tsparticles/template-404 project — npm create 404

Add assets for tests easily and avoid 404 network errors.

A better error-handler for Lad and Koa. Makes `ctx.throw` awesome (best used with koa-404-handler)

Codecademy's fancy schmancy 404 page.

Make 404 pages agent-friendly for AI crawlers & LLMs

```ts import { WormSolid } from '@404-software/fontawesome'

Default 404 Pagelet used if the router cannot dispatch to any route

Opt-in, manifest-backed early 404 responses for Nuxt production apps.

404 backend

Simple replacement for the Netlify plugin `netlify-plugin-no-more-404`

Custom 404 error page for KajKowalski Edge.

This package provide a function that generates html code for common error pages such as 404, 500, etc.

Detect 404/Not found pages from sitemap

Crawl a URL to generate a sitemap and find 404 errors with one command