This is probably the wrong place to ask, but...

This builds on top of the same mechanisms used by containers (cgroups), but builds an infrastructure on top of it that's suited to desktop GUI applications installed and run by end-users rather than server-based, command-line applications run usually on headless servers and deployed by a devops/sysadmin type. The end result can look very similar, but docker and friends care a *lot* more about scriptability and large scale, while this cares more about user experience and easy third-party distribution.