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 * [RSGISLib](https://bitbucket.org/petebunting/rsgislib/src/bf7933996822?at=default) - The Remote Sensing and GIS software library (RSGISLib) is a collection of tools for processing remote sensing and GIS datasets. The tools are accessed using Python bindings or an XML interface.
 * [OSRM (Open Source Routing Machine)](http://project-osrm.org/) - High performance routing engine written in C++, designed to run on OpenStreetMap data. Services available: Nearest, Route, Table, Match, Trip, Tile.
 * [OpenOrienteering Mapper](https://github.com/OpenOrienteering/mapper) - OpenOrienteering Mapper is a software for creating maps for the orienteering sport.
+* [TauDEM](https://github.com/dtarb/TauDEM) - Terrain Analysis Using Digital Elevation Models (TauDEM) software for hydrologic terrain analysis and channel network extraction. 
+* [osgearth](https://github.com/gwaldron/osgearth) - A free open source C++ geospatial toolkit.
++ [dreich_algorithm](https://github.com/csdms-contrib/dreich_algorithm) - Algorithm for extracting channel networks from high resolution topographic data.
 
 
 ## C