FAUCET (https://github.com/faucetsdn/faucet), originally by REANNZ, is an open source SDN/OpenFlow controller for experimental and enterprise networks. FAUCET runs in production at multiple sites and supports multiple hardware vendors. This blog describes FAUCET itself and FAUCET use cases. The blog author works at Google and has contributed to FAUCET. Any opinions stated here are my own, not those of Google.