Composite C1 for Windows

Used Composite C1 for Windows?

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Editors’ Review

Download.com staffFebruary 20, 2026

Composite C1 is a free open source CMS built for marketing and web professionals. It offers a user-friendly yet professional system for creating new company websites using Microsoft technologies.

Top Recommended Alternative

QuickPHP

Free

Pros
- Free and open source
- Easy to use for editors
- Fulfills needs of hardcore developers
- Access to fully functional CMS out of the box
- Option to add free packages like SEO-assistant
Cons
- Commercial packages available separately
- Commercial license offers product warranty and professional services

Composite C1 for Windows

Used Composite C1 for Windows?

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Full Specifications

GENERAL

Release: April 30, 2012

Latest update: February 20, 2026

Version: 3.2

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 7
Windows 2000
Windows 10
Windows Vista
Windows XP

Additional Requirements: None

POPULARITY

Total Downloads: 268

Downloads Last Week: 0

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Last Updated

User Reviews

5/5

2 User Votes

Free, Modern, Fast, Customizable
aboozar_aDecember 30, 2010
Pros
- based .NET Framework 4 - supports XSLT - works with XML database so you don't need to pay for a database if you have a small website - developers delivered for developers - well structured - powerful administration IDE
Cons
- there not a lot of modules or templates available however, you can easily implement your template if you have HTML knowledge - if you are not familiar with XSLT and XML structures you might find it difficult at first
Summary
Comparing to DotNetNuke it's lighter and more customizable. I really enjoyed it and have decided to use it for a few projects.
Super high quality, top modern, developer+user friendly
mawtexDecember 30, 2010
Pros
Really nice UI, great developer features and tooling, both ASP.NET Form, MVC and XSLT support, great markup control, multi language features, easy to setup and manage, quality extensions, great forum support and free open source.
Cons
Few starter templates which mean you need good html/css skills to use it, steep learning curve for more advanced stuff. Portions of the API is undocumented. Still few extensions.
Summary
Here is a .NET based free open source web CMS where the UI, source code and the way the way you develop is really well executed. As an XSLT and .NET developer I am able to build advanced websites with solid admin UI with a lot less code and still end up with a top notch result. Composite C1 is excellent for building customized websites. If you are in the website building industry and care about ASP.NET and/or XSLT this is definitely worth checking out.

Developer’s Description

By Composite A/S

A free open source Web content management system.