Dropbox - Online Sync and File Sharing
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.
Microsoft OneDrive for Business - First of all, we think it appropriate to make it clear for the readers, Microsoft OneDrive for Business is different from what is Microsoft OneDrive that is only a cloud storage and limited sharing service.
CloudApp - CloudApp allows you to share images, links, music, videos and files. Here is how it works: choose a file, drag it to the menubar and let us take care of the rest.
Google Drive - Access and sync your files anywhere