uDig is described as «GIS software program produced by a community led by Canadian-based consulting company Refractions Research. It is based on the Eclipse platform and features full layered open source GIS. It is written in Java and released under GNU Lesser General Public License» and is a GIS software in the travel & location category. There are more than 25 alternatives to uDig for a variety of platforms, including Windows, Online / Web-based, Mac, Linux and Android. The best alternative is QGIS, which is both free and Open Source. Other great apps like uDig are Mapbox Studio, ArcGIS, GRASS GIS and SAGA GIS.uDig alternatives are mainly GIS Software but may also be Map Services. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of uDig.