libgd-gis

libgd-gis is a native GIS and map-rendering engine for Ruby built on top of ruby-libgd. It lets Ruby applications generate map images, tiles, and geospatial visualizations directly from latitude/longitude data — without external map servers or image pipelines. Maintained by ggerman on GitHub, where it has earned 129 stars from the community.

It's actively developed around geojson, geolocation, geospatial, and is a solid reference for anyone building with these tools.