Shameless plug: here's my indie-project that converts an OpenAPI/Swagger spec into something that aims to look like Stripe's API Reference: https://portal.dev

Here are a couple of example docs: https://space-api.portaldocs.dev (and the OpenAPI behind it: https://github.com/portaldev/nasa-apod-api-docs/blob/main/op...)

https://recur-api-beta.portaldocs.dev

At my previous workplace we've built the whole docs portal (including the API reference) as a custom static website with Contentful (a json CMS) underneath. It was a real pain in the ass to edit and maintain, that's how I got the idea.