Over the course of the last two years, the open source ownCloud project has emerged as a leader in cloud storage. What ownCloud provides is an open source alternative to proprietary cloud storage systems like Dropbox and Box. With ownCloud, a user can setup cloud storage on their own server or a third party server.

More speed with Go instead of PHP: ownCloud Infinite Scale is ready for use
Infinite Scale is a complete modernization of ownCloud 10, which has replaced PHP with Go for greater speed and efficiency.