Syncany - Syncany is an open-source cloud storage and filesharing application.
Link Shell Extension - Link Shell Extension (LSE) provides for the creation of Hardlinks , Junctions , Volume Mountpoints...
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
Symlink Creator - Symbolic Link Creator. GUI for mklink (Microsoft Windows symlink utility).
Dropbox - Online Sync and File Sharing
FileMenu Tools - FileMenu Tools lets you customize the context (right-click) menu of Windows Explorer.