Unlike iOS, virtually all of the Android userland, and all of its SDK, is also open source: AOSP is the name of the project containing it all. IIRC only two ma

Unlike iOS, virtually all of the Android userland, and all of its SDK, is also open source: AOSP is the name of the project containing it all. IIRC only two major things aren't included: binary blob-only drivers, and proprietary Google apps: Play store, Maps, etc. Despite those limitations, you can practically just `git clone` and build the entire OS for your device. :-) https://source.android.com https://source.android.com