caldav, cardav
http://sabre.io/baikal/install
DAViCal is a server for calendar sharing. It is an implementation of the CalDAV protocol which is designed for storing calendaring resources (in iCalendar format) on a remote shared server.
https://www.davical.org
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http://git-annex.branchable.com/assistant
sabre/dav is the most popular WebDAV framework for PHP. Use it to create WebDAV, CalDAV and CardDAV servers.
http://sabre.io/dav
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https://hubic.com/en/offers
Helix Core is the versioning engine that stores and manages access to versioned files, tracks user operations, and records all activity in a centralized database.
https://www.perforce.com/downloads/helix-versioning-engine-p4d
boar as "version control for large binary files
https://bitbucket.org/mats_ekberg/boar