I recently added Document360 for API docs to my Chapter 4: OpenAPI spec and generated reference docs in my API doc site. Document360 lets you publish API reference documentation from OpenAPI specification files. Importantly, it lets you integrate this API reference content smoothly with your broader knowledge base and regular documentation, all within a single portal. The platform supports various import methods for OpenAPI files (versions 3.1, 3.0, 2.0) and Postman Collections, focusing on the publishing aspect rather than OpenAPI authoring (which I feel is a smart move to avoid unnecessary UI complexity).