This is a Behavior Tree library meant to be an alternative to SMACH, FlexBE and the like. It includes a ReactJS-based web GUI and all the building blocks you need to build moderately advanced mission control Behavior Trees without writing a single line of code!
See details: https://github.com/fzi-forschungszentrum-informatik/ros2_ros_bt_py_web_gui/tree/release/2.0.4