www.opendocman.com
OpenDocMan is a free document management system (DMS) designed to comply with ISO 17025 and OIE standard for document management. It features web based access, fine grained control of access to files, and automated install and upgrades

http://www.epiware.com
A powerful open source alternative for Enterprise Document Management. Enable users to collaborate on projects, share documents, create schedules, and manage tasks. Epiware GPL project and document management, for those that like to be on the cutting edge of development. Take control of your information and content today.

http://owl.anytimecomm.com/
Owl is a multi user document repository (knowledge base) system written in PHP for publishing files/documents onto the web for a corporation, small business, group of people, or just for yourself.

http://sourceforge.net/projects/kt-dms
KnowledgeTree is the leading commercial open source electronic document management software designed for teams and small to medium-sized organizations

http://www.edocplus.com/
?he eDocXL product line is being developed by BSI SA, a leading vendor of document scanning, document imaging and document management software solutions in the EMEA Region. Scan, Capture, Retrieve and Share information from any paper or digital document, eMail and PDF very fast and very easily.

http://www.oasys-software.com/products/document_management/columbus/
Columbus is not only one of the easiest document management systems to use and the world's most popular choice, but is available as a free 'Personal Edition'. Columbus utilises a powerful viewing engine and supports many commercial file formats, including Microsoft Office, AutoCAD*, MicroStation* and Hewlett Packard HPGL/2.

http://www.informatik.com/free.html
Informatik Archiver is a comprehensive document archiving system with user-customizable Microsoft Access database engine (or an ODBC database) and support for multipage PDF, Tiff, and many other graphics files.