What public APIs are being used?

Q: Are you using public domain APIs? If any can I see the source code?

A: Yes, both System Tuner and Android Tuner are using open-source code.

A very small chunk of BusyBox Version 0.19.1 is being used unmodified in Android Tuner and System Tuner, it can be found here on busybox.net.

Android Tuner also uses these open-source projects without modifications of any sorts:

• The iptables binary is used to control Linux firewall and its sources can be found on this GitHub.
• The Xposed framework is used for some tasks which would be otherwise impossible and its sources can be found on this GitHub.
• The SwitchCompatLibrary is used for switches on pre-ICS devices, and its sources can be found on this GitHub.
• The Android LockPattern library is used for the pattern-lock view, and its sources can be found on this GitHub.