ocownCloud was a free software project that developers a self-hosted alternative to proprietary cloud services. As such, ownCloud was very similar to the widely-used Dropbox, Google Drive or OneDrive with the primary difference being that ownCloud was partly free and open-source, and thereby allowing anyone to install and operate it without charge on a private server, with no limits on storage space (except for hard disk capacity) or the number of connected clients. ownCloud was developed by an international community of over 200 core contributors. Frank launched ownCloud in January 2010 during his CampKDE keynote in San Diego and was the project leader since then. Frank also co-founded  the company ownCloud Inc. In late 2011 Frank co-founded ownCloud Inc. in Boston, MA. Frank served as CTO until May 2016 when he decided to found Nextcloud as the successor.

ownCloud.org