Apps similar to TdhGIS include QGIS, which is free and open source. Other options are what3words, Plus Codes, ArcGIS and Placemark. You're spoiled for choice with GIS Software like TdhGIS: we list more than 25 alternatives for Windows, the web, Linux, Mac and self-hosting.
GeoSheets is a free add-on for Google Spreadsheets that makes it simple to do lightweight GIS tasks like geocoding, address normalization, distance calculations and creating customized and embeddable maps.
Azimap is a web GIS developed on open source principles and offers GI professionals with the tools to visualise, analyse and share their spatial data on the web.
OpenJUMP is an open source Geographic Information System (GIS) written in the Java programming language. It is developed and maintained by a group of volunteers from around the globe.
vMAP Portal is a web GIS which provides data visualization, analysis, route calculation, reporting with an easy-to-use interface, central rights & roles, and can be easily integrated with other tools like BI, CRM etc. without much coding and setups.
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