Where Am I is an application designed to be useful when traveling to a new place. It helps provide up-to-date maps and access to other people's opinions about the places you might visit. It also lets you record and share your experiences with both other mobile phone users and your friends back home.
SAGA GIS (System for Automated Geo-scientific Analysis) is a geographical information system (GIS). The SAGA GIS API supports grid data like digital terrain models and satellite images, vector data, and tables. This API makes it easy to implement new algorithms and exempts the developer from hassle programming overhead like user-interface design or file I/O. SAGA GIS comes with a large collection of modules, in areas of terrain-analysis, geo-statistics, image processing, and process simulation.
shape2ge is a set of two applications for converting ESRI shapefiles into Google Earth KML files. It consists of a batchable converter engine that reads conversion options from an XML config file generated by the front-end or other methods. The CLI-based front-end allows you set scales and offsets (from shapefile coords to earth coords), and also to assign different display styles to different feature types.
Micropolis is a city simulation game engine based on the original classic SimCity source code. Micropolis is based on the Tcl/Tk version of SimCity. It consists of the micropolis module, which is the engine recast as a C++ class; the cellengine module, which is a cellular automata machine engine; and the tileengine module, which is a Cairo based tile renderer. It is intended to be used with the OLPC's Sugar user interface environment, but layered so the core code is useful in other contexts.