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by captain-asshat 5349 days ago
While certainly not free, SQL Server 2008 introduced some pretty nice spacial data tools. It can find points within a radius, capture points within a polygon, intersections/unions, and quite a bit more. It also has full support for true spacial indexes which makes dealing with large amounts of data very fast.

I've just completed a project using these tools quite extensively, and found them a really nice way of handling all my geo data. Being T-SQL, there's not much to learn to make use of it either.