hdoc vs Markdoc

It is a modern documentation tool for C++ with the goal of helping developers create great documentation, painlessly. To accomplish this goal, it automatically generates API documentation, puts Markdown pages alongside your documentation, and lets you search through your documentation interactively. Above all, it is designed to produce great results with minimal configuration and hassle.

It is a Markdown-based document format and a framework for content publishing. It was designed internally at Stripe to meet the needs of our user-facing product documentation. It extends Markdown with a custom syntax for tags and annotations, providing a way to tailor content to individual users and introduce interactive elements.