Mintlify is open-sourcing its MDX Engine, which exposes two APIs: `getCompiledMdx` and `MDXComponent`. The former takes in MDX content and converts it into an object that can be rendered by the `MDXComponent`, while the latter renders HTML based on this object. This engine is crucial for creating exceptional documentation as it focuses on the developer experience, allowing developers to integrate Mintlify's package and access its flavored markdown and code syntax highlighting. The team welcomes contributions to the project and encourages developers to give their engine a try when developing new blogs in 2024. To get started, one can directly access the NPM package, install it using npm or yarn, and follow the provided example to use the engine in Next.js projects.