Project Summary
C1 CMS is a fully featured free open source web content management system developed for (and by) web professionals who focus on customized websites.
The user interface is very functional and task oriented and enables users of varying skills to complete tasks and cooperate using familiar tools and guides. High-end technical skills are not a requirement to build websites with C1 CMS, but if you've got them, you will own the system.
In a Nutshell, C1 CMS...
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took an estimated 84 years of effort (COCOMO model)
starting with its first commit in June, 2010
ending with its most recent commit almost 4 years ago
Quick Reference
Mozilla Public License 1.1
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Use Patent Claims
Forbidden
Sub-License
Hold Liable
Required
Distribute Original
Disclose Source
Include Copyright
State Changes
Include License
Include Install Instructions
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
Did You Know...
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nearly 1 in 3 companies have no process for identifying, tracking, or remediating known open source vulnerabilities
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you can subscribe to e-mail newsletters to receive update from the Open Hub blog
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65% of companies leverage OSS to speed application development in 2016
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data presented on the Open Hub is available through our API
30 Day SummaryJul 13 2026 — Aug 12 2026
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12 Month SummaryAug 12 2025 — Aug 12 2026
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