This book deals with integrated Web, mobile, and IoT technologies. Novel approaches and techniques, new tools and frameworks are needed to address the increasing complexity of the distributed computing paradigms that are coming and the applications therein. This volume contains selected and extended papers from a) the Web Technologies track at the 33rd ACM/SIGAPP Symposium On Applied Computing, b) the Web Technologies track at the 32nd ACM/SIGAPP Symposium On Applied Computing, and c) the Software Development for Mobile Devices, Wearables, and the Internet-of-Things Minitrack at the 51st Hawaii International Conference on System Sciences. Overall, it provides a uniform view of cutting-edge research in Web, mobile and IoT technologies.