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stargazing app?
(slrpnk.net)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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That is weird. Thank you for bringing that distinction to my attention, I'd always assumed it was FOSS and just locked a few features behind a paywall on Google Play.
Looks like the mobile version is created by the same person who initially created Stellarium (and the current project coordinator for the FOSS version), but forked and taken closed source? Very confusing.
https://www.stellarium-labs.com/about/