There are 2 repositories under geostyler topic.
GeoStyler-Style-Parser implementation for SLD
GeoStyler Style Parser implementation for OpenLayers styles
GeoStyler Data Parser implementation for Web Feature Services (WFS)
GeoStyler-Geoserver-Style-Parser implementation for SLD
GeoStyler Data Parser implementation for GeoJSON
GeoStyler Data Parser implementation for Shapefile
GUI to upload a GeoJSON and style a Leaflet Choropleth Map. Export Map as Image, stand-alone HTML or as Styled Layer Description (SLD)