Name:Least Authority (Free)
URL:https://leastauthority.com/
Description:Simple and secure cloud storage 
Utility:This free tool provides – 

• Secure off site back-up system for individuals and businesses 

Special Features:

• Free and open source 
• Even if few servers go down, data is still safe and available 
• Easy access to previous revisions of data 
• 100% client side encryption
• Access control and scalability