Dropbox is an easy to use freemium cloud storage solution. It has a client sync utility for multiple platforms.

Microsoft OneDrive is a cloud-based storage solution from Microsoft.

Box is an online file sharing and content management service.

Resilient, fast and scalable file sync software for enterprises and individuals.

Koofr offers safe EU based cloud storage with 2 GB free cloud storage space for life and options to connect multiple cloud accounts.

Gladinet is an on-premises, enterprise file synchronization and sharing (EFSS) platform.

SpiderOak is a cloud-based backup and restore solution to protect against data loss.

MEGA is the cloud-based file hosting solution.

SugarSync is a cloud service that enables active synchronization of files across computers and other devices.

Copy.com is a discontinued cloud storage service that offered near-unlimited space and huge bonuses for referrals.

Cubby is a flexible way to keep your files organized and accessible, both for individual productivity and shared collaboration.

Agora is a platform for generating actionable insights on social messages.