“JEDI Math” is a free mathematical library developed under the MPL for Delphi, Kylix, FPC and Lazarus. The library provides routines for matrices/vectors, regression, geometry, physics, equation rendering and raytracing among others.
MapWindow GIS is an open source geographic information system (GIS) that includes a set of vector and raster data visualization and analysis components as well as an end-user Windows GUI which can be extended through plug-ins. www.MapWindow.org.
PlutoStatus is a system to publish the current status of your systems. It includes mirroring.