Open source software is free and enables people to do great things with it. This is the #opensource software/data I've been using to create maps, process images, make animations etc. related to #NASA's #Mars2020 mission:

#GIMP : https://www.gimp.org
#Geogebra : https://www.geogebra.org
#ImageMagick : https://imagemagick.org
#QGIS : https : https://www.qgis.org
#Stellarium : https://stellarium.org

@kevinmgill's and @stim3on's flats: https://github.com/kmgill/mars-raw-utils-data/tree/61a3b4477b541d4749c66b348c2098a931369d93/caldata

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