Dropbox lets you store your files online, sync them to all your devices, and share them easily. Get started for free, then upgrade for more space and security features.

Google Drive is Google's file sync app that lets you store all of your files online alongside your Google Docs documents, and keep them synced with all of your devices.

Google Forms is an easy way to collect data from the web with a simple UI and powerful editor. Works hand-in-hand with Google Sheets!