https://openlayers.org/ under 2-Clause BSD Full-featured library for rendering geospatial data and creating interactive maps.
https://getbootstrap.com/docs/5.0/getting-started/license/ under MIT License Responsive UI components and layout framework.
http://davidshimjs.github.io/qrcodejs/ under MIT License QR code generation for sharing map states.
http://trac.osgeo.org/proj4js/ under MIT License Cartographic projections support (coordinate transformations).