The directed graph shell, dgsh, allows the expressive expression of efficient big data set and streams processing pipelines using existing Unix tools as well as custom-built components. It is a Unix-style shell allowing the specification of pipelines with non-linear scatter-gather operations. These form a directed acyclic process graph, which is typically executed by multiple processor cores, thus increasing the operation's processing throughput.
You can find a complete introduction, reference documentation, and illustrated examples in the suite's web site.
See also, a quick video overview and the associated (open access) paper, Extending Unix pipelines to DAGs, published in the IEEE Transactions on Computers, 66(9):1547–1561, 2017.