18.4
Scalar is a collection of API products for documentation, client generation, API management, requests, and MCP server use.
Free planOpen sourceWebAPILinux
Alternatives to Stoplight Elements
27.0
WebAPIExtension
37.0
Sphinx is a free Python application for building technical documentation from structured text.
Free planWebAPILinux
- 4
Asciidoctor
Asciidoctor is a free, open-source text processor and publishing toolchain for turning AsciiDoc files or strings into formats including HTML5,…
Free planWebAPIExtensionLinux6.9Free plan - 5
JSON Schema for Humans
JSON Schema for Humans generates static HTML or Markdown documentation from valid JSON Schema in JSON or YAML format.
Free planLinuxmacOSSelf-hostedWindows6.5Free plan - 6
StepShot
StepShot is a macOS app that turns recorded workflows into step-by-step tutorials, SOPs, and training documents.
Free planmacOS6.5CN¥269 one-time - 7
TypeDoc
TypeDoc is a free documentation generator for TypeScript projects.
Free planAPILinuxSelf-hosted6.5Free plan - 8
DocFX
DocFX is a free static site generator for technical documentation.
Free planAPILinuxmacOSSelf-hosted6.4Free plan - 9
Scaladoc
Scaladoc is Scala’s documentation tool for turning comments in Scala code into documentation about the code’s structure.
Free planWebLinuxmacOSWindows6.3Free plan - 10
Antora
Antora is a documentation site generator for technical writers working in AsciiDoc.
LinuxmacOSSelf-hostedWindows6.2From $14,000 a year - 11
Doxygen
Doxygen is a free documentation generator that turns source-code comments into documentation and parses classes, functions and variables.
Free planLinuxmacOSWindows6.2Free plan - 12
TechWriter for Databases
Windows6.2From $49 a month - 13
unittest
unittest is Python’s unit testing framework for automating tests and organizing their setup and execution.
Free planLinuxmacOSWindows6.2Free plan - 14
mdBook
mdBook is a free command-line tool for turning Markdown into books, including product or API documentation, tutorials, and course materials.
Free planLinuxmacOSWindows6.1Free plan - 15
MkDocs
MkDocs is a free static site generator for project documentation written in Markdown and configured with a YAML file.
LinuxmacOSSelf-hostedWindows6.1 - 16
Natural Docs
Natural Docs is a free, open-source command-line documentation generator that scans code comments and text files to create HTML documentation, including API references.
Free planLinuxmacOSWindows6.1Free plan - 17
RDoc
RDoc is free software for generating and viewing documentation for Ruby projects.
Free planLinuxSelf-hosted6.1Free plan - 18
Jazzy
Jazzy is a free, MIT-licensed command-line utility for generating Swift and Objective-C documentation.
Free planLinuxmacOS6.0Free plan - 19
phpDocumentor
phpDocumentor turns PHP source code and DocBlock comments into API documentation.
Free planLinuxmacOSSelf-hosted6.0Free plan - 20
Widdershins
Widdershins converts API definition files into documentation inputs for rendering pipelines.
Free planAPILinuxSelf-hosted6.0Free plan - 21
AsyncAPI Generator
AsyncAPI Generator is free, open-source software that uses an AsyncAPI document and a template to create documentation, code, diagrams,…
Free planLinuxSelf-hosted5.9Free plan - 22
Sandcastle Help File Builder
Sandcastle Help File Builder (SHFB) creates help files for managed class libraries, combining API reference documentation with conceptual topics.
Free planWindows5.9Free plan - 23
Docsify
Docsify is an open-source documentation site generator that turns Markdown files into a website.
WebSelf-hosted5.8 - 24
PyDoctor
PyDoctor is a free standalone tool that analyzes Python source code statically and generates API documentation as HTML files.
LinuxmacOSWindows5.8 - 25
rustdoc
rustdoc is the documentation generator included with the standard Rust distribution.
LinuxmacOSWindows5.8 - 265.8Free plan
- 27
Doc-O-Matic
Windows5.7 - 28
JSDoc
APISelf-hosted5.4 - 29
5.1 - 30
Daux.io
WebLinuxmacOSWindows5.0