Everybody wants their own custom ringtone or alarm, and with this Open Source Android app users can highlight the part of a song they have on their phone already, then save it as a new file, or set it as an alarm or ringtone.

    The original open-source ringtone editor for Android, first published in 2008 and downloaded by millions of users worldwide. This app is the only 'official' distribution of the Ringdroid open-source project; it does not, and never will, contain ads.

User Guide: http://code.google.com/p/ringdroid/wiki/UsingRingdroid

Website: http://code.google.com/p/ringdroid/
Issue Tracker: http://code.google.com/p/ringdroid/wiki/FAQ
Source Code: http://code.google.com/p/ringdroid/source/checkout

Note: Even though These Apps are Open Source and available from other sources it is still recommended to download them from the Google Play Store. Unless building from source Always use the official Google Play Store to keep your Android device safe, secure, and up to date.