Dropbox - Online Sync and File Sharing
Google Drive - Access and sync your files anywhere
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
WeTransfer - WeTransfer is a free service to send big or small files from A to B.
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.
ShareFile - Secure file sharing and sync