Default Thinking of Going to School to become a dev? What are some open source Android projec

I am interested in mobile development for the Android. I was curious, what are some open source projects that I could add to a portfolio if I am interested in Android development? Something to work on in my spare time?
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AOKP(Jellybean 4.1.2)Task(OLD) Task650 Kitkat (NEW, current build)
noop/intellidemand 144-918mhz: 918mhz(975) 864mhz(950) 702mhz(900) 594mhz(885) 486mhz(885)384mhz(865)192mhz(860)144mhz(860)
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