PAGC is a command line and web service C library for performing postal address geocoding. A postal address geocoder takes a sufficiently detailed postal addresses and produces a digital map that displays the spatial location of those addresses.
That project aims at providing a clean service API, and the corresponding C++ implementation, for freely available geographical-based services on the Internet (e.g., GeoIP service by the GPL-based software77 database, Yahoo! GeoPlanet, etc.).
The NHD Software Project is a collection of the utilities, scripts, APIs, standards, and application extensions used for the quality assurance of stream and river data, conflation/generalisation of hydrographic data, and other hydrologic data maintenance.