Setster is very useful for teachers. It will allow you to set appointments and keep an online calender. This would be great to upload a backup of your daily calender so that you are able to make adjustments when need be depending on where you are at.
Dropbox is an easy way to share and store your files online. No complicated interfaces to learn. Dropbox runs in the background on your desktop. Sync your files automatically to your computers and the web. Sign in and access your files from any browser or mobile device
ZumoDrive is the hybrid cloud storage for all of your media. You can access your music, photos, and documents from anywhere with your favorite applications. You don't have to think, or sync your files again, it just works. ZumoDrive's hybrid cloud storage also means you will never have to worry about running out of space
Hordit lets you unleash the information hoarder in you. Store and share links, documents, notes and more - as much as you want. Filter articles from your favorite blogs and news sites with research assistant. Manage the sites you visit regularly with your daily read. And keep track of links for later perusal with look later.