Orfeo ToolBox (OTB) is an open source project for state-of-the-art remote sensing. Built on the shoulders of the open-source geospatial community, it can process high resolution optical, multispectral and radar images at the terabyte scale. A wide variety of applications are available: from ortho-rectification or pansharpening, all the way to classification, SAR processing, and much more!
All of it’s algorithms are available via Modeverdi, QGIS, Python, C++ etc. Modeverdi is OTB’s UI with an emphasis on hardware accelerated rendering for high resolution imagery (optical and SAR). For more information click here.