Siafu simulates individual agents and their context, from home to city-wide scenarios. As a developer, you use the API to write your simulation for the purposes of data-set generation, test or visualization, optionally hooking it to your own application.
The GPS Simulator simulates a GPS receiver which emits NMEA sentences over Bluetooth. It can be used to test location based applications on real mobile devices, in particular on mobile devices which have a JSR 179 implementation based on a connected GPS.