Fluid is a collection of cross-platform QtQuick components for building fluid and dynamic applications, using the Material Design guidelines. Online documentation is available at docs.liri.io. We develop using the git flow method this means that the develop branch contains code that is being developed and might break from time to time. If you want to check out a stable version just install one of the releases or clone the master branch that has the latest released version.
The Basic Object System (BOS) means to provide a dynamic environment for hosting and using components. It can also be described as a general purpose software framework based on component technology.