Open-Source CMS · dnnsoftware

Dnn.Platform

DNN Platform is a Microsoft .NET-based open-source CMS used to build websites, intranets, and portals. It includes content management, multi-site capability, REST APIs, and a marketplace of extensions. The project has been actively maintained since 2013 and claims to power over 750,000 sites.

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Source: GitHub — github.com/dnnsoftware/Dnn.Platform

1.1k

GitHub stars

774

Forks

Primary language

MIT

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	dnnsoftware/Dnn.Platform
Owner	dnnsoftware
Primary language	C#
License	MIT — OSI-approved
Stars	1.1k
Forks	774
Open issues	336
Latest release	v10.3.2 (2026-05-05)
Last updated	2026-07-07
Source	https://github.com/dnnsoftware/Dnn.Platform

What Dnn.Platform is

C# ASP.NET CMS with multi-tenancy, REST APIs, drag-and-drop UI, rich-text editing, and extensibility via custom modules. Built for the Microsoft ecosystem with Azure compatibility. Currently at v10.3.2 with CI/CD pipeline and code quality monitoring via NDepend.

Quickstart

Get the Dnn.Platform source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/dnnsoftware/Dnn.Platform.git2cd Dnn.Platform3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Multi-site Microsoft ecosystem deployments

Organizations running .NET infrastructure can deploy a single DNN instance to power multiple branded sites with shared administration, reducing operational overhead.

Rapidly deployable corporate intranets and portals

DNN's built-in drag-and-drop UI, role-based security, and pre-built modules enable quick intranet or partner extranet deployment without custom backend development.

Extensible e-commerce and community sites

Marketplace of hundreds of modules and themes allow rapid feature addition (payment processing, forums, social features) without building from scratch.

Implementation considerations

Requires .NET Framework/Core and Windows server expertise; deployment on Azure is documented but demands DevOps familiarity.
Extension ecosystem is large but quality/security is unvetted; third-party module review and vetting process is critical pre-deployment.
Multi-site provisioning is a core strength but configuration complexity grows with localization (6 languages built-in) and custom skinning.
Migration from legacy DNN versions or competing CMS platforms requires careful data mapping and testing; no official migration toolkit mentioned.
SSL, SEO, and security roles are built-in but require deliberate configuration; defaults should not be assumed safe.

When to avoid it — and what to weigh

Headless/API-first CMS required — DNN is monolithic and page-render focused. If you need a decoupled CMS feeding multiple front-end apps, this is poorly suited.
Non-Microsoft tech stack — DNN requires .NET Framework or .NET Core expertise and Windows/IIS hosting. Java, PHP, or Node.js teams will face steep learning curve.
Minimal operational overhead desired — DNN CMS itself is free but requires skilled .NET ops, careful extension vetting, and ongoing security patching for a mature CMS.
Strict SaaS isolation required — Multi-tenancy is single-instance, not true SaaS isolation. Shared infrastructure may not satisfy strict regulatory/data residency requirements.

License & commercial use

MIT License. Permissive open-source license allowing modification, redistribution, and commercial use with minimal restrictions. Requires attribution; no warranty provided.

MIT License explicitly permits commercial use without restriction. However, commercial support, SLAs, and liability are separate from the open-source license. Review DNN Software's commercial offerings (support plans, hosting) separately if production deployment demands guaranteed uptime/support.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Adequate
License clarity	Clear
Deployment complexity	Moderate
DEV.co fit	Good
Assessment confidence	High

Security considerations

MIT license imposes no warranty; security is shared responsibility. Platform includes built-in role-based access control, SSL support, and scheduler for patches. However: (1) extension ecosystem is not centrally audited—third-party modules are a supply-chain risk; (2) configuration defaults require hardening review; (3) no explicit mention of security policies, disclosure procedures, or CVE tracking; (4) 336 open issues suggest ongoing bug fixes. Security posture depends heavily on operator diligence and extension selection.

Alternatives to consider

Umbraco (also .NET, open-source)

Modern .NET CMS with cleaner API-first architecture and smaller footprint; better suited to headless deployments but smaller ecosystem than DNN.

WordPress with WP Engine / Automattic (PHP-based, multi-site capable)

Dominant market share, lower .NET expertise required, massive plugin ecosystem, managed hosting options; multi-tenancy less elegant than DNN but easier ops.

Sitecore (proprietary .NET CMS)

Enterprise-grade personalization and multi-site management; significantly higher cost and licensing complexity, but commercial support and security guarantees included.

Software development agency

Build on Dnn.Platform with DEV.co software developers

Contact us to discuss your .NET CMS requirements, multi-site architecture, extension vetting, and deployment strategy. We'll help you assess fit and build a secure, maintainable roadmap.

Talk to DEV.co

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Dnn.Platform FAQ

Is DNN truly free for commercial use?

Yes, MIT License permits commercial deployment without license fees. However, commercial support plans, hosting, and third-party module licenses are separate costs. Self-hosted production requires .NET ops expertise.

How does multi-site work in a single instance?

One DNN application can host multiple portals (sites) with shared core but separate content, users, and themes. Reduces infrastructure cost but adds database and security design complexity.

What is the module/extension security story?

DNN Marketplace hosts free and commercial modules, but no explicit central code review or security certification. Operators must vet third-party code before deployment. This is a typical open-source risk.

Does DNN have a roadmap or governance structure?

.NET Foundation backed with Leadership Team and MVPs listed on community site. GitHub shows versioning and release schedule documents. No public 12-month roadmap visible in provided data; review community forums or contact maintainers for forward direction.

Software development & web development with DEV.co

Adopting Dnn.Platform is usually one piece of a larger software development effort. As a software development agency, DEV.co provides software development services and web development expertise — pairing senior software developers and web developers with your team to design, build, and operate open-source cms software in production.

Ready to evaluate DNN for your organization?

Contact us to discuss your .NET CMS requirements, multi-site architecture, extension vetting, and deployment strategy. We'll help you assess fit and build a secure, maintainable roadmap.

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