CmisSync synchronizes documents from and to any ECM server, using the CMIS protocol. It can server as a Dropbox replacement, powered by your existing server. (GPL)
Cross-platform
Nextcloud offers industry-leading on-premises file sync and online collaboration technology. Our expertise is in combining the convenience and ease of use of consumer-grade solutions like Dropbox and Google Drive with the security, privacy and control business needs. (AGPL)
Linux
Pydio, formerly known as AjaXplorer, is an open-source file-sharing and synchronisation software that runs on the user's own server or in the cloud. (AGPL)
Cross-platform
Seafile enables you to build private cloud for file sharing and collaboration among team members in your company/organization. First you create a file library in the web and upload files to it. Then you share it into a team or with another user. (GPL)
Cross-platform
Syncany is an open-source cloud storage and filesharing application. It allows users to backup and share certain folders of their workstations using any kind of storage, e.g. FTP, Amazon S3 or Google Storage. (GPL)
Linux
5 applications