ArcGIS Online is Esri’s cloud‑based mapping and analysis platform. Below is a curated list of 20 alternative GIS solutions—ranging from open‑source libraries to commercial SaaS platforms—that provide web‑mapping, spatial analysis, data hosting, and visualization capabilities.
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Hosted version of the open‑source QGIS desktop, offering web map publishing, WMS/WMTS services, and simple data storage.
Developer‑focused platform for custom vector tiles, interactive maps, and location‑aware applications with robust APIs.
Location intelligence platform with data visualization, spatial analytics, and easy‑to‑use Builder for non‑technical users.
Cloud‑based geospatial analysis engine for petabyte‑scale satellite imagery and geospatial datasets, with JavaScript & Python APIs.
Desktop GIS from Precisely offering powerful spatial analysis, cartography, and integration with web services.
Open‑source server for publishing vector and raster data via OGC standards (WMS, WFS, WMTS, WCS).
Community‑driven fork of Mapbox GL JS, providing high‑performance vector tile rendering for web and mobile.
Feature‑rich JavaScript library for building web‑based GIS applications with support for many data formats and services.
Lightweight, mobile‑friendly JavaScript library for interactive maps, extensible via plugins.
SaaS platform delivering raster & vector tiles, map styling, and APIs for fast map embedding.
Enterprise‑grade location platform offering maps, routing, geocoding, and live traffic data via REST APIs.
On‑premises or private‑cloud GIS stack (Portal, Server, Data Store) that replicates many ArcGIS Online capabilities.
Open‑source GIS with a strong focus on terrain analysis, hydrology, and geoprocessing modules.
Powerful open‑source GIS for raster, vector, and geospatial modeling, widely used in academia and research.
Free software for spatial data analysis, exploratory data visualization, and spatial econometrics.
Desktop GIS focused on market analysis, demographic data, and business‑oriented mapping.
Crowdsourced street‑level imagery platform with APIs for integrating photos into GIS workflows.
Design‑first web UI for creating custom map styles, data layers, and publishing tilesets.
Desktop GIS that pairs with ArcGIS Online/Enterprise for authoring, analysis, and publishing web layers.
Satellite imagery provider offering daily global coverage via API and web‑map integration.