Compare the Top Free Software Documentation Tools as of October 2025

What are Free Software Documentation Tools?

Software documentation tools are designed to help developers and technical writers create, manage, and share documentation related to software applications. These tools facilitate the writing of user guides, API references, installation instructions, and other types of technical content. They often include features like version control, templates, collaborative editing, and integration with code repositories to streamline the documentation process. Some popular tools offer support for various output formats, such as HTML, PDF, and Markdown, making it easier to distribute documentation to different audiences. By using these tools, teams can ensure that their documentation remains accurate, up-to-date, and accessible throughout the software development lifecycle. Compare and read user reviews of the best Free Software Documentation tools currently available using the table below. This list is updated regularly.

  • 1
    Interfacing Enterprise Process Center (EPC)
    Interfacing’s Digital Twin Organization software provides transparency and Governance to improve Quality, Efficiency, and ensure Regulatory Compliance. Map, analyze, and automate processes, manage regulatory compliance, assess risks within a single platform! Interfacing’s digital twin solution (Enterprise Process Center - EPC) is an enterprise management system that helps companies digitalize processes to streamline operations, increase productivity, and continuously improve. Interfacing’s digital business platform – Rapid Application Development (RAD) Tools, with its Low-Code Development methodology will optimize usage of your technical resources and maximize transparency for ongoing improvement. Discover how our Low-Code Rapid Application Development module provides all the tools to create and deploy Custom, Scalable, Secure, and Mobile ready Applications in Days vs. Months!
    Starting Price: $10/month/user
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  • 2
    Docsie

    Docsie

    Docsie

    Docsie is an award-winning digital documentation and knowledge management platform based in Ontario, Canada. You can access Docsie through a SaaS web application to create & edit documentation from any location. Then, you can publish content to a dynamic knowledge portal that users can access whenever they need information! Docsie offers powerful business-grade features to write & manage product documentation: - Docsie Pilot onboarding - Custom portal design & optional training for paid plans - Internal & external portal for employees & end-users - Workspaces - Knowledge base analytics & user feedback collection - Free custom domain - Markdown import & export - WYSIWYG Editor - iFrame embed - SwaggerAPI import - Snippet, fragment, document & topic templates - Help center & in-app help interface - Guided tour builder - Version & language management - Webhooks - AI translation & content generation - Project management - RBAC/JWT/SSO for security
    Starting Price: $39 per month (annual)
  • 3
    ProProfs Knowledge Base
    ProProfs Knowledge Base is a knowledge management software used to create highly-searchable online FAQ’s to improve customer service and reduce tickets. ProProfs helps centralize access to all your files, documents and how-to articles ensuring they can be accessed across multiple devices and platforms. Organizations can easily share important information to train their sales, customer service and support teams. It is also an effective method for introducing new hires to company procedures during the onboarding process. ProProfs Knowledge Base improves productivity by making it easy for employees and customers to instantly find what they're looking for, whenever and wherever they need it. ProProfs Knowledge Base Software eliminates the need to answer the same questions over and over again.
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    Starting Price: $6 per user per month
  • 4
    Tettra

    Tettra

    Tettra

    Tettra is an internal knowledge base with smart workflows to help you answer repetitive questions. Tettra helps you document important processes, policies, and procedures in one centralized place. This makes onboarding new teammates much faster and answering questions less repetitive. Most of our time is spent in cloud apps. As software continues to eat the world, the amount of information we create and the number of tools we use continues to rise. With all this information comes downsides. This fragmentation of tools and teams makes it tough to share context and agree on the best decisions, especially cross-functionally. On growing teams, your best employees shouldn't be bogged down by repetitive questions. To move fast, everyone needs access to the same information and principles. Your internal knowledge base will only be successful if everyone contributes to it. Tettra makes it easy for anyone to contribute knowledge by referencing content in other systems.
    Starting Price: $99 per month
  • 5
    Nuclino

    Nuclino

    Nuclino

    Nuclino works like a collective brain, helping teams bring all their knowledge, docs, and projects together in one place. It's a modern, simple, and blazingly fast way to collaborate, without the chaos of files and folders, context switching, or silos. Nuclino is trusted by over 12,000 teams and companies across the world.
    Starting Price: $5.00/month/user
  • 6
    WackoWiki

    WackoWiki

    WackoWiki

    WackoWiki – Small, lightweight, handy, expandable, multilingual Wiki-engine. It's designed for speed and extensibility. WackoWiki is completely free and open source, and it is BSD licensed. Includes a WYTIWYG editor, easy installer, section edit, thumbnail creation, many localizations, RSS autodiscovery, Links can be CamelCase or freely formed links using an intuitive two-character markup. Compatible with PHP 8.0 - 8.4 and MariaDB / MySQL. On-the-fly correction of punctual typos & spec. characters. Access control through per-page access control lists. Automatic table of contents generation. Page watching & email notification on changes/comments. Powerful diff between revisions.
    Starting Price: $0
  • 7
    Balsa

    Balsa

    Balsa

    Balsa is for organizing ideas, tracking projects, and collaborating with your team. Give it a try and see how it can simplify your workflow! We are huge fans of products like Dropbox Paper and Notion. These products are great for lots of different use cases, but we aim to make a document that is great for making software—with the ability to write specs and put a plan into action in one place. Simplified text formatting that make docs easy to write and a joy to read. Structured modules like milestones that can power views like timelines and rosters. All-in-one workflow from doc to execution without the overhead of out-of-date documentation or switching tools. Balsa visualizes your projects for you - from a bird's eye view, you can see how they might affect each other and the progress of your team overall.
    Starting Price: $29 per user per month
  • 8
    Docuo

    Docuo

    Spreading

    Docuo is an All-in-one tool documentation platform. It is a SaaS platform that helps you to build a great self-service knowledge base for your customers and internal users (public or private knowledge bases). It can Elevate your team's capabilities with one powerful documentation tool. Eliminate fragmented workflows, consolidate tasks, and supercharge efficiency. Benefits of using Docuo: —AI-Assisted Writing:Docuo Copilot automates documentation writing so developers can focus on coding, not writing. —Cross-Team Collaboration: Enable seamless collaboration so your developers and tech writers can co-create stellar documentation with ease. —Easy-to-use Editor: Intuitively embed images, videos, code and more. Customizable blocks make rearranging content effortless. —Hassle-Free Doc Management: Centralize docs for all products enabling effortless version control. —Publish Docs Sites: Docuo handles optimizations for responsiveness, mobile-friendliness and SEO
    Starting Price: $31/month/team
  • 9
    Bit.ai

    Bit.ai

    Bit Tech Labs

    The World's Most Powerful Workplace and Document Collaboration Platform. Built for teams and individuals to create, collaborate, and organize all your work in one place from anywhere in the world. Create fast dynamic notes, documents, wikis, knowledge bases, projects, client deliverables, training guides and client portals, while integrating across the apps you work with. Organize all your work in one place. Use Bit for smart notes, research, freelance work, client deliverables, classwork & more in one beautiful place. Work with your team, clients, partners or students, regardless of where they are located and collaborate on projects together in real-time. Utilize guest access to bring clients, partners and contractors into your world. Bit scales across your entire organization, regardless of whether everyone is in one location or distributed across the globe. Keep all your company knowledge across departments, teams, projects, and clients organized in one central hub.
    Starting Price: $8 per user per month
  • 10
    Swimm

    Swimm

    Swimm

    Never let onboarding, knowledge silos, or context switching slow you down. Use Swimm to create and edit docs that are coupled with your code, auto-synced, and integrated into your workflow. Swimm's language agnostic editor, paired with its Smart Tokens and Snippet Studio is the foundation for modern documentation. Build great media-rich docs coupled with the code. Swimm's Auto-sync algorithm, helps your documentation stay in sync through refactoring and reorganization. You don't have to worry about changing file names, function names, or your implementation. Swimm will be able to keep up with it. Swimm checks your docs as your code evolves, and notifies you if your changes affect your documentation. Access docs right next to the code they refer to. Stay in your IDE and your flow. When you click on a link, your IDE will open a new tab with the documentation perfectly rendered from Markdown.
    Starting Price: $29 per month
  • 11
    Tango

    Tango

    Tango

    Catch up on your documentation, cut down on meetings and interruptions, and save hours every week. We’ll automatically create a step-by-step guide with perfectly cropped screenshots, links, and annotations. Blur out sensitive information, add annotations, draw freehand, or customize your logo and colors. Publish your guide to multiple knowledge bases with one click, share a direct link, or export to PDF, HTML, or Markdown. You click through your process. Tango does the documenting. Create 10 how-to guides in the time it used to take to do one. Say goodbye to long videos and walls of text. Tango turns any process into a beautiful, shareable how-to guide. Document steps on any website or software. Tango with all your favorite tools. Highlight what's important with an arrow, rectangle, circle, or text. Or draw anything you can imagine with the freehand pen. Resize images to focus on what matters and cut what doesn’t.
    Starting Price: $16 per month
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