PCRaster Processing Provider for QGIS
QGIS is an open-source geographic information system for all major platforms. The PCRaster Processing Provider plugin eases the usage of PCRaster operations within QGIS. The plugin can be directly installed using the QGIS Plugins tool.
NutShell is a windows shell for PCRaster. The function of NutShell is to facilitate the running of PCRaster commands and edit and run PCRaster models (scripts).
GDAL is a translator library for raster geospatial data formats. It also comes with a variety of useful command line utilities for data translation and processing.