Best API Documentation Tools for Linux of 2025

With ClickHelp you can create online FAQs, help files, user manuals, knowledge bases, guides, etc. and publish them instantly. Also, you can create printed documentation in various formats. ClickHelp is easy to set up and use - no installation, runs in a web browser and supports multiple platforms: Mac OS, Windows, and Linux. Why ClickHelp? Here are some points: * Easy to use WYSIWYG topic editor, as well as HTML source mode. * Translation module to create a multi-language documentation site * Password-protected online help. * ClickHelp can import content from Microsoft Word, HTML, Markdown, RTF, CHM, ODT, etc. and export to CHM, HTML5 Web Help, PDF, DOCX, etc. * Powerful full-text search. * In-depth analytics and reporting. * Context help engine. * Branding options. * Global find and replace. * Automatic link validation and update. * Dynamic content support for single-sourcing - snippets, variables, conditional blocks. * Single Sign-On support for Google, Microsoft Azure AD, Salesforce and custom * OpenID Connect providers * Taxonomies * Readability scores and metrics. Integrations: Zapier, Google Analytics, Google Search Console, Zendesk, AddThis, Google Translate, YouTube and much more.

Archbee is a lightweight, flexible docs tool. Build product documentation, internal wikis, knowledge bases, API references, developer guides, changelogs, diagrams — in one app. Archbee helps your team communicate asynchronously. This makes you effective and remote-ready—one of the fastest & smartest editors ever strapped on a documentation tool. If you have a complex product or your users are developers, you need product docs. We make it mega easy to set up branded docs on your domain with all the bells and whistles.

The ultimate development environment has now been redesigned specifically for crafting documentation. By utilizing a singular authoring platform, the need for multiple disparate tools is removed entirely. With features like a built-in Git interface, an integrated build system, automated testing capabilities, and a customizable layout that’s ready for immediate use, you can dedicate your efforts to what truly matters: your content. This environment allows you to merge the benefits of Markdown with the precision of semantic markup. Whether you choose to stick with one format or enhance Markdown with semantic elements, Mermaid diagrams, and LaTeX math expressions, flexibility is at your fingertips. Maintain high standards for the quality and integrity of your documentation through over 100 real-time inspections right within the editor, as well as tests during live previews and builds. The live preview accurately reflects how your audience will engage with the documentation. You have the option to preview a single page within the IDE or launch the complete help website in your browser without the need to execute a build. Additionally, you can effortlessly repurpose content, whether it be smaller snippets or entire sections from your table of contents, ensuring efficiency and consistency throughout your documentation process. This innovative environment streamlines your workflow and enhances productivity, making documentation easier and more effective than ever before.

Swagger Codegen streamlines your development workflow by automatically generating server stubs and client SDKs for any API outlined in the OpenAPI specification, allowing your team to concentrate more effectively on implementing and promoting your API. Transitioning from design to development is remarkably simplified when using Swagger Codegen within SwaggerHub, where you can create stubs in widely-used programming languages such as Java, Scala, and Ruby with minimal effort, requiring just a few clicks to get started. This efficiency not only saves time but also enhances collaboration among team members throughout the API lifecycle.

NSwag serves as a robust toolchain for working with Swagger/OpenAPI versions 2.0 and 3.0, designed for environments like .NET, .NET Core, ASP.NET Core, and TypeScript, and it is developed in C#. This tool empowers developers to create OpenAPI specifications directly from their existing API controllers and subsequently generate client code based on those specifications. By merging the capabilities typically offered by Swashbuckle for OpenAPI/Swagger creation and AutoRest for client generation, NSwag streamlines the process into a single, efficient toolchain. Among its notable features are the ability to produce both Swagger 2.0 and OpenAPI 3.0 specifications from C# ASP.NET (Core) controllers, the option to serve these specifications through ASP.NET (Core) middleware while providing integrated interfaces like Swagger UI or ReDoc, and the capability to create C# or TypeScript clients/proxies from the generated specifications. Furthermore, NSwag accommodates a variety of usage options, including a user-friendly graphical interface known as NSwagStudio, command-line tools that work across Windows, Mac, and Linux platforms, and seamless integration into C# projects through NuGet packages, making it a versatile choice for developers. With its extensive functionality, NSwag significantly enhances the efficiency of API development and client generation.

REST United serves as a user-friendly platform that streamlines the creation of Software Development Kits (SDKs) for REST APIs across a variety of programming languages such as PHP, Python, Ruby, ActionScript (Flash), C#, Android, Objective-C, Scala, and Java. By following just five straightforward steps, users can generate SDKs that come with highly customizable documentation and easy-to-understand example code, which significantly boosts developer engagement. Additionally, the platform utilizes the Postman Chrome plug-in to aid in the testing and debugging of REST APIs, thus optimizing the overall development workflow. For developers working on their own REST APIs with frameworks like Node.js, Ruby Sinatra, Scala Scalatra, or Java JAX-RS, REST United provides valuable support in generating server-side code. Furthermore, users can expect prompt assistance, with a commitment to addressing inquiries within 12 hours. In summary, REST United is dedicated to making REST API development more accessible and efficient by offering tools that effectively bridge the gap between API design and its implementation, ultimately fostering a smoother development experience for all users. As such, the platform plays a crucial role in enhancing productivity in software development.

DapperDox is an open-source tool that offers an extensive, ready-to-use rendering of your OpenAPI specifications, effortlessly merging them with your documentation, guides, and diagrams formatted in GitHub-flavored Markdown. Transform the way you publish your API Swagger specifications and manage multiple API specifications as a cohesive suite of products, with the ability to cross-reference them as needed. Its built-in API explorer facilitates experimentation directly from the documentation pages and integrates smoothly with your authentication and API key setup. Additionally, DapperDox can serve as a proxy for your developer platform, ensuring a seamless process for API key generation and management alongside your specifications and guides. You can customize themes to showcase your documentation in your preferred style. Created by authors dedicated to API documentation, DapperDox aims to enhance the quality and usability of the documentation available to developers, ultimately fostering a better understanding and interaction with APIs. This focus on usability ensures that both novice and experienced developers find value in the platform, making it a versatile tool for any API project.

OpenAPI Generator is a versatile open-source utility that facilitates the automatic generation of client libraries, server stubs, API documentation, and configuration files based on an OpenAPI Specification (OAS) document. With support for numerous programming languages and frameworks, it streamlines the process for developers looking to incorporate APIs into their applications efficiently. By automating the generation of boilerplate code, OpenAPI Generator not only shortens development time but also promotes uniformity in API interactions. This empowers teams to concentrate on executing business logic instead of getting bogged down by repetitive tasks such as data serialization, deserialization, and managing HTTP requests. The tool is particularly valuable in API-driven development scenarios, enhancing the integration of third-party services and making it easier to maintain alignment between API consumers and providers. Ultimately, OpenAPI Generator serves as a crucial resource for development teams aiming to boost productivity and ensure high-quality API integrations.

Konfig is an innovative developer tool designed to streamline the creation of SDKs, documentation, demos, and tutorials for REST APIs, making the onboarding process for external developers more efficient. By simply importing an OpenAPI Specification or Postman Collection, Konfig can automatically generate SDKs in widely-used programming languages such as TypeScript, Python, Java, C#, PHP, Ruby, Go, Swift, and Dart. The platform enhances the quality of these SDKs by utilizing a linter to detect and correct errors in the OpenAPI Specification and by generating test cases to ensure that updates to the API do not disrupt existing SDK functionality. Furthermore, Konfig produces intuitive, branded documentation that updates automatically in response to any modifications in the API specification, thereby ensuring consistency between the documentation and the generated SDKs. Users can also create interactive demos and tutorials using familiar Markdown, which includes the capability to execute code directly in the browser for a more immersive learning experience. Overall, Konfig not only simplifies the technical aspects of API integration but also enriches the educational resources available to developers.