OSSIM is a powerful suite of geospatial libraries and applications used to process imagery, maps, terrain, and vector data. The software has been under active development since 1996 and is deployed across a number of private, federal and civilian agencies. It is compatible with more than 100 raster and vector formats and over 4000 different projections and datums. Orfeo ToolBox (OTB) is an open-source C++ library for remote sensing images processing, distributed under the CeCILL-v2 license. It has been initiated and funded by CNES (French space agency) in the frame of a program named ORFEO to prepare, accompany and promote the use and the exploitation of the images derived from Pléiades satellites (PHR). Orfeo ToolBox aims at enabling large images state-of-the-art processing even on limited resources laptops, and is shipped with a set of extensible ready-to-use tools for classical remote sensing tasks, as well as a fully integrated, end-users oriented software called Monteverdi2. Orfeo provides a wide range of remote sensing functions: radiometry, PCA, change detection, pan sharpening, image segmentation, classification and filtering. One really interesting aspect of this software is the capability to do object based image analysis. Source.