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Free iPad app: https://itunes.apple.com/us/app/quiver-3d-coloring-app/id650645305?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.puteko.colarmix
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Free Android Phone app: https://play.google.com/store/apps/details?id=com.escapistgames.starchart
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.escapistgames.starchartgoogleeducation
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Paid Mac program: https://itunes.apple.com/us/app/star-chart/id1102412974?mt=12&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/star-chart/id714180827?mt=8&at=10l6SU
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Free iPad app: https://itunes.apple.com/us/app/spacecraft-3d/id541089908?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=gov.nasa.jpl.spacecraft3D
Free iPad app: https://itunes.apple.com/us/app/stratalogica/id588832342?mt=8&uo=4&at=10l6SU