Google has just announced the winners of the Android Developer Challenge 2 (or ADC2) that'll surely bring a lot of great applications to the limelight. They've announced three winners in each of the ten categories and three overall winners. Cash prizes were given out to the winners and we're hoping that developer challenges like these will continue to spur Android app development.

The three overall winners were SweetDreams, What the Doodle!?, and WaveSecure. SweetDreams is an app that allows you to change phone settings to avoid late night calls. You can also conserve battery by having SweetDreams automatically shut off Wi-Fi, Bluetooth, etc. What the Doodle!? is a real time online multiplayer game where one player draws out a given phrase and others try to guess it. And finally, WaveSecure is a security solution that protects your device, data and privacy.

The full list of winners is available after the break and more information on all the winning applications can be found here.

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Overall winners:

  • SweetDreams
  • What the Doodle!?
  • WaveSecure

Education/Reference Winners:

  • Plink Art
  • Word Puzzle
  • Celeste

Entertainment Winners:

  • A World of Photo
  • SongDNA
  • Solo

Games: Arcade/Action Winners:

  • Speed Forge 3D
  • Graviturn
  • Moto X Mayhem

Games: Casual/Puzzle Winners:

  • What the Doodle!?
  • Totemo
  • Mazeness

Lifestyle Winners:

  • SweetDreams
  • SpecTrek
  • FoxyRing

Media Winners:

  • Buzz Deck
  • SPB TV
  • FxCamera

Productivity/Tools Winners:

  • WaveSecure
  • Hoccer
  • Tasker

Social Networking Winners:

  • Ce:real – Everyday trends
  • SocialMuse
  • SpotMessage

Travel Winners:

  • Trip Journal
  • iNap: Arrival Alert
  • Car Locator

Misc Winners:

  • Rhythm Guitar
  • Andrometer
  • Calton Hill GPSCaddy