Sites and apps similar to ReadMe include Insomnia REST Client, which is open source with a free version. Other options are GitBook, Wiki.js, Widget-Board and Archivy. There's no shortage of Documentation Generators like ReadMe, with more than 25 alternatives for Mac, Windows, self-hosting, Linux and Android.
Free browser-based OpenAPI editor from Postman. Design or import a Swagger 2.0, OpenAPI 3.0, or OpenAPI 3.1 spec (YAML or JSON) and see live documentation with inline validation as you type. No signup, no install. Part of Postman's suite of free developer tools at postman.
United States
DeepDocs is a GitHub AI agent that automatically keeps your docs like API documentation, SDK guides, and tutorials in sync with your codebase, so you never have to manually update them again.
Switzerland
Doctave lets you use docs-as-code without having to manage complicated tooling or infrastructure. Write your docs in Git, and Doctave will automatically publish your documentation site when you commit your changes.
Collaborative docs platform with an AI style reviewer and an API your agents can use. Publish to your own domain. $29/mo flat for unlimited sites and editors.
Singapore
