Mapshaper is software for editing Shapefile, GeoJSON, TopoJSON, CSV and several other data formats, written in JavaScript. The mapshaper command line program supports essential map making tasks like simplifying shapes, editing attribute data, clipping, erasing, dissolving, filtering and more.

MapShaper - Tools for editing Shapefile, GeoJSON, TopoJSON and CSV files

CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin. It uses WebGL for hardware-accelerated graphics, and is cross-platform, cross-browser, and tuned for dynamic-data visualization. 
<ul>
<li>It provides support to visualize high-resolution global terrain. Optionally exaggerate terrain. </li>
 <li>Draw 3D models using glTF 2.0 with Physically-Based Rendering (PBR) materials, animations, skins, and morph targets. </li>
 <li>Use legacy Google Earth Enterprise terrain and imagery. </li>
 <li>Industry standard vector formats, such as KML, GeoJSON, and TopoJSON, including terrain clamping. </li>
 <li>Draw and style a wide range of geometries like points, labels, billboards, boxes, spheres, ellipsoids, and cylinders etc </li>
 <li> Camera navigation with mouse and touch handlers for rotate, zoom, pan with inertia, flights, free look, and terrain collision detection. </li>
</ul>

CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin. It uses WebGL for hardware-accelerated graphics, and is cross-platform, cross-browser, and tuned for dynamic-data visualization.

Cesium - An open-source JavaScript library for world-class 3D globes and maps

Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) used for data management, image processing, graphics production, spatial modelling, and visualization of many types of data. GRASS supports raster and vector data in two and three dimensions. The vector data model is topological, meaning that areas are defined by boundaries and centroids; boundaries cannot overlap within a single layer.
 
GRASS GIS contains over 350 modules to render maps and images on monitor and paper; manipulate raster, and vector data including vector networks; process multispectral image data; and create, manage, and store spatial data. GRASS GIS offers both an intuitive graphical user interface as well as command line syntax for ease of operations. GRASS GIS can interface with printers, plotters, digitizers, and databases to develop new data as well as manage existing data.

Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) used for data management, image processing, graphics production, spatial modelling, and visualization of many types of data. GRASS supports raster and vector data in two and three dimensions. The vector data model is topological, meaning that areas are defined by boundaries and centroids; boundaries cannot overlap within a single layer.

GRASS GIS - Geographic Resources Analysis Support System

QGIS is an Open Source Geographic Information System. QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster and vector data formats, with new support easily added using the plugin architecture.
 
QGIS provides a continously growing number of capabilities provided by core functions and plugins. You can visualize, manage, edit, analyse data, and compose printable maps.

QGIS is an Open Source Geographic Information System. QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster and vector data formats, with new support easily added using the plugin architecture.

QGIS - Geographical Information System (GIS)

Whitebox GAT is an open-source geographical information system (GIS) and remote sensing package. The Whitebox GAT project began in 2009 and was conceived as a replacement for the Terrain Analysis System (TAS). Whitebox GAT is intended to provide a platform for advanced geospatial data analysis with applications in both environmental research and the geomatics industry more broadly.
 
It was envisioned from the outset as providing an ideal platform for experimenting with novel geospatial analysis methods. Equally important is the project’s goal of providing a tool that can be used for geomatics-based education.

Whitebox GAT is an open-source geographical information system (GIS) and remote sensing package. The Whitebox GAT project began in 2009 and was conceived as a replacement for the Terrain Analysis System (TAS).  Whitebox GAT is intended to provide a platform for advanced geospatial data analysis with applications in both environmental research and the geomatics industry more broadly.

Whitebox Geospatial Analysis Tools - An open-source GIS and remote sensing package

uDig is an open source desktop application framework, built with Eclipse Rich Client (RCP) technology. The goal of uDig is to provide a complete Java solution for desktop GIS data access, editing, and viewing. It supports GeoRSS, geospatial web services and provides the framework on which complex analytical capabilities can be built, and gradually subsuming those capabilities into the main application.

uDig - User-friendly Desktop Internet GIS

The JCS Conflation Suite is an API and set of interactive tools which perform conflation on spatial datasets. It features:
 <ul>
	<li>JCS contains functions for performing various kinds of geo-spatial conflation processes.&nbsp;
	 The major conflation problems it addresses are Coverage Cleaning,
	 Coverage Alignment and Road Network Matching.&nbsp;&nbsp;
	<li>JCS supports QA operations for detecting and visualizing errors and
	 both automatic and manual cleaning functions to adjust geometry.&nbsp;
	<li>JCS supplies an API providing full programmatic access
	 to all functions
	<li>JCS provides manual editing tools to perform human-assisted conflation for
	 cases which automated methods cannot solve
</ul>

The JCS Conflation Suite is an API and set of interactive tools which perform conflation on spatial datasets.

JCS - Conflates spatial datasets

SAGA is a free geographic information system (GIS), with a special 'Application Programming Interface' (API) for geographic data processing. This API makes it easy to implement new algorithms. The SAGA API supports grid data, vector data, and tables. It has been designed for an easy and effective implementation of spatial algorithms.
 
It supports far more than 450 freely available functions for geodata analysis, Georeferencing and cartographic projections, Geostatistics: GWR, variograms, ordinary & universal Kriging and lot more.

SAGA is a free geographic information system (GIS), with a special 'Application Programming Interface' (API) for geographic data processing. This API makes it easy to implement new algorithms. The SAGA API supports grid data, vector data, and tables. It has been designed for an easy and effective implementation of spatial algorithms.

SAGA GIS - System for Automated Geoscientific Analyses

MapWinGIS.ocx is a C++ based GIS programming ActiveX Control and API that can be added to a Windows Form in VB, C#, Delphi, etc. providing your app with a map.

MapWinGIS - ActiveX Map and GIS Component

HydroDesktop is a free and open source GIS enabled desktop application that helps you search for, download, visualize, and analyze hydrologic and climate data registered with the CUAHSI Hydrologic Information System. 
 
HydroDesktop is a free software tool for finding time series of water and climate data submitted by the hydrologic research community as well as water agencies and data curators around the world. This community publishes their data so that it can be searched by other users in this common geographic interface. Users can search for data by type, location, and within certain date ranges. Users can view the sources of data as well. All available data in a specific map area will be returned. Point locations for the data will be displayed on the map with respective metadata about the collections at those stations. Users can then download the data to explore it in graph or table form. Extensions enable more sophisticated on-screen analysis of downloaded data, including integration with R and OpenMI. Users can also export data to their local computers for use in other programs.

HydroDesktop is a free and open source GIS enabled desktop application that helps you search for, download, visualize, and analyze hydrologic and climate data registered with the CUAHSI Hydrologic Information System. 

HydroDesktop - Hydrologic Information System Desktop Application

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