Dropbox - Online Sync and File Sharing
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
WeTransfer - WeTransfer is a free service to send big or small files from A to B.
iTerm2 - A terminal emulator for macOS that does amazing things.