ILWIS (Integrated Land‑Water Information System) is a free, open‑source GIS and remote‑sensing package. Below is a curated list of 20 widely‑used GIS solutions—both open‑source and commercial— that can serve as alternatives for spatial data analysis, mapping, and image processing.
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A powerful, cross‑platform open‑source GIS with a rich plugin ecosystem, extensive vector/raster tools, and tight integration with GDAL/OGR.
Esri’s flagship professional GIS desktop application offering advanced 3D visualization, spatial analytics, and seamless ArcGIS Online integration.
A mature open‑source GIS focused on raster processing, geostatistics, and terrain analysis; integrates well with QGIS.
Open‑source GIS from the Spanish community, providing robust vector editing, 3D view, and support for many OGC standards.
System for Automated Geoscientific Analyses – a free GIS focused on terrain analysis, hydrology, and raster processing.
Commercial desktop GIS known for fast map creation, business‑oriented spatial analytics, and strong cartographic output.
Open‑source server for publishing vector and raster data via OGC web services (WMS, WFS, WMTS).
Free software for spatial data analysis and visualization, especially suited for exploratory spatial data analysis (ESDA).
Commercial remote‑sensing and photogrammetry suite offering advanced image processing, classification, and 3D modeling.
Industry‑standard remote‑sensing software for image analysis, spectral processing, and machine‑learning classification.
Open‑source GIS built on .NET, providing a lightweight desktop environment and extensible plugin architecture.
Open‑source geospatial analysis toolbox focused on terrain analysis, hydrology, and raster processing.
User‑friendly open‑source GIS desktop application built on Eclipse, supporting OGC standards and plug‑ins.
High‑performance commercial GIS/DBMS offering fast data handling, 3D visualization, and scripting.
Comprehensive Chinese GIS platform with strong CAD integration, spatial analysis, and mobile GIS capabilities.
Versatile commercial GIS with robust raster conversion, LiDAR processing, and 3D terrain modeling.
Cloud‑based GIS and location intelligence platform for building interactive maps, spatial analytics, and data visualizations.
Developer‑focused mapping platform offering APIs, SDKs, and a powerful style editor for custom web/mobile maps.
Open‑source JavaScript library for creating dynamic web maps that consume OGC services and vector tiles.
Esri’s SaaS GIS environment for sharing, analyzing, and visualizing spatial data via web maps and apps.