I was just looking into charting libraries for React/React Native, and Apache ECharts seems like a great contender for cross-platform data visualization. The libraries that I came across - react-echarts (https://github.com/hugocxl/react-echarts) and react-native-echarts (https://github.com/wuba/react-native-echarts) - both seem to be actively developed, and the fact that it's under Apache is a huge plus for future development prospects and maintenance of the project.