We present Palmyra 3.0, a cloud-based, configurable, and user-friendly platform for morphology and syntax annotation through dependency-tree visualization. Palmyra 3.0 implements a robust system that stores data on the cloud. By default, Palmyra 3.0 comes with an Arabic dependency parser that generates highly accurate trees, but it is easily configurable to support dependency parsers in other languages. Palmyra 3.0 provides default configuration files for a number of predefined formalisms, such as UD and CATiB, and a number of user-friendly features to support annotators.