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

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

Tresorit is an online cloud storage service based in Switzerland and Hungary that emphasizes enhanced security and data encryption for Businesses.

ASUS WebStorage is a Cloud Storage Service that helps user backup data, sync file between devices and share data to friends.

Tonido is remote access and home server software for network-attached storage.

Storage Made Easy provides a hybrid Cloud File Server Enterprise File Share and Sync Solution.

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