Top 3 r-tree open source projects

Rbush
RBush — a high-performance JavaScript R-tree-based 2D spatial index for points and rectangles
skyline-query
Simple implementation of spatial skyline query algorithms
geojson-rbush
GeoJSON implementation of RBush — a high-performance JavaScript R-tree-based 2D spatial index for points and rectangles
1-3 of 3 r-tree projects