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surfit is an open source and free gridding and contouring software. surfit can do interpolation/approximation of points, contours and surfaces, can take fault lines and trend surfaces into account, can use inequalities and other conditions. Supports a lo52 weekly downloads
CAVOR is an engine for building apps that involve both graphic and text/numeric data. Primarily GIS is the initial focus, but consider also CAD, CASE, project management (eg PERT charts), and others. Built-in scripting, C API, also supports Tcl and Java.2 weekly downloads
The VTK Geography library is an extension for the Visualization Toolkit that includes classes for spatial processing, coordinate system management, and reading/writing data in GIS formats (shapefile and DGN) and databases (PostGIS and ArcSDE).0 weekly downloads