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Neo4j Spatial is a library of utilities for Neo4j that faciliates the enabling of spatial operations on data. In particular you can add spatial indexes to already located data, and perform spatial operations on the data like searching for data within specified regions or within a specified distance of a point of interest.
RTree2D is a 2D immutable R-tree for ultra-fast nearest and intersection queries in plane and spherical coordinates
YCanvas is an open source 2D tile renderer library written in ActionScript 3. It provides high performance solution for rendering world maps. The library also contains Stage3D (GPU) accelerated implementation based on Starling.
Open framework for calculating spatial urban sprawl indices and performing disaggregated population estimates using open data
Report of GTFS performance compared to schedule.