As presented at NSDI '18, HUYGENS is a software clock synchronization system that uses a synchronization network and leverages three key ideas described in the paper and presentation linked below. HUYGENS achieves synchronization to within a few 10s of nanoseconds under varying loads, with a negligible overhead upon link bandwidth due to probes. Because HUYGENS is implemented in software running on standard hardware, it can be readily deployed in current data centers.