geojson.io is a quick, simple tool for creating, viewing, and sharing maps. geojson.io is named after GeoJSON, an open source data format, and it supports GeoJSON in all ways - but also accepts KML, GPX, CSV, GTFS, TopoJSON, and other formats.
GeoJSONLint is an app that validates your GeoJSON and shows your feature(s) on a map if everything checks out ok.
RawGit - serves raw files directly from GitHub with proper Content-Type headers.
QGIS - A Free and Open Source Geographic Information System.
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