DropBox is the first cloud storage service offered with 2GB of free storage. As it is the very first, there are so many people using the service even though the free tier is very limited in today's standard.
DropBox provides the most intuitive user interface of all cloud storage services available today.
Additional Information
Free Tier
2GB
Editor's Notes
DropBox is the most popular online storage service offered to date, and it is supported on any platform you may use including Linux, Kindle, and Blackberry on top of the standard platforms like Windows, macOS, Android and iOS.