Replicant software development kit (SDK)
"Android is not a self-hosting system; development for Android needs to be done on some other system. The tools in Google's “software development kit” (SDK) appear to be free, but it is hard work to check this. The definition files for certain Google APIs are nonfree. Installing the SDK requires signing a proprietary software license, which you should refuse to sign. Replicant's SDK is a free replacement." - https://www.gnu.org/philosophy/android-and-users-freedom.en.html
Leaders and contributors
Resources and communication
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