Teedy - Teedy is a lightweight document management system packed with all the features you can expect from big expensive solutions but still easy to use.
Alfresco in the Cloud - Alfresco is an enterprise content platform that you can use in the cloud or behind your firewall.
Paperless - Developers and publishers of Mac, Win, and iOS productivity, home and office and writing software such as MacGourmet, Paperless, MacJournal and many more. Based in MN.
docEdge DMS by Pericent - Love Your Documents
Paperless-ngx - paperless-ngx has 6 repositories available. Follow their code on GitHub.
KRYSTAL - Document Management System - KRYSTAL - Document Management System enables organizations to manage digital content and automate document-driven processes.