Evernote is considered to be a second brain. It allows you to not only take notes, but it makes note taking smarter. You can save images, drawings, scribbles, notes, audio, video and other formats and making all of it searchable for later on.
Google Drive is one of the most popular free cloud storage products available. Most people get 15-20GB of free cloud storage and it easily integrates with all of Google's other products. It's a must have tool for any entrepreneur.