For writing technical styled documentation, I've found fumadocs to be amazing.

It looks great out of the box and supports a product switcher, which can be used for maintaining related products or product versions. It also supports OpenAPI imports and API playgrounds.

The best part is that it is just a fully fledged (nextjs) app that is entirely customizable with relative ease. We just moved to it from Docusaurus and couldn't be happier.