Dropbox - Online Sync and File Sharing
Easy Context Menu - Easy Context menu is a Freeware portable utility that includes useful tweaks for the context menus.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Shell context menu manager - Powerful and lightweight context menu manager for Windows File Explorer.
Mega - Secure File Storage and collaboration
Link Shell Extension - Link Shell Extension (LSE) provides for the creation of Hardlinks , Junctions , Volume Mountpoints...