GeoEtrim (Geospatial Evaluation and Training of Images) is a set of academic software packages to evaluate optical images geospatially. Although GeoEtrim was developed in the MATLAB environment in the past, it was decided to be compiled in another programming language (C#) in order to overcome the challenges like importing/reading very big sized image files, collecting Ground Control Point (GCP) and Independent Check Point (ICP) in an easy way and running the orientation models, etc. Creating projects, importing image(s), enhancing the image contrast, collecting GCP&ICP and running sensor independent orientation models through sub-package GeoTransform are the major opportunities of the current version. In addition, GeoTransform itself enables blunder and parameter validation tests. GeoEtrim can also be used free-of-charge for academic purposes; therefore, its user community increases rapidly. This paper focus on both theoretical background and graphical user interface of GeoEtrim 2020 executed version.