The DMS KnowledgeTree now supports CMIS. It supports CMIS draft version 0.61.

KnowledgeTree® is open source document management software that connects people, processes, and ideas. Collaborate, securely store all your critical documents, address compliance challenges, and focus on providing a simple solution that works for your business.

The CMIS functionality has been tested with the following CMIS Clients:

• CMISSpaces
• KnowledgeTree Drupal CMIS Module
• CMIS Explorer

The following functionality is already supported:

• View repository information and capabilities.
• List folder contents (children or descendant collections) and browse into sub-folders.
• Fetch Folder or Document parent object
• Add Folders and Documents
• Deletion of Documents and Folders
• Moving of Documents and Folders
• Viewing of Documents via the document’s contentStream property.
• Document Checkout
• Cancel Document Checkout
• Document Check-in (limited)

Check here for more details: http://wiki.knowledgetree.com/Cmis

The following video shows a former CMIS implementation of KnowledgeTree:

If you want to read further details check out the KnowledgeTree blog.