Net ML is a system which runs in a browser -- with help from "the cloud'" which can be used to analyse and design networks. Versions of Net ML have existed for 10 years however the version now available is the first to include full graphical editing as well as a rich collection of network design and analysis tools. Net ML provides a way to navigate through views of one network, and through a network of networks. The software itself is networked and provides the means for network researchers to jointly develop networks and algorithms for research and educational purposes. The tools provided in Net ML include layered and single-layer network design, robust network design, availability analysis, and loss analysis. Networks can also be transformed by means of XSLT scripts.