Style Editors

You can edit/create GL JSON Stylesheets with many open source tools

http://github.com/maputnik/editor

https://github.com/go-spatial/fresco

http://sputnik-maps.github.io/mvt-styler/

https://github.com/map-ir/vector-style-editor#readme  https://www.npmjs.com/package/@map.ir/vector-style-editor