JET is a dataflow framework and server for multi-node embedded systems
Git repository: https://git.jeelabs.org/jcw/jet
The JET architecture is in the process of being redesigned - for a recent (i.e. mid-2017) update about what’s going on, see this JeeLabs weblog post.
JET is made from a number of components, as summarised in this diagram:
The remote “nodes” are based on microcontrollers, see the Embello project.