If you're into android Orbot always comes to mind.

On Tuesday, December 16, 2014, Abhiram Chintangal <abhiram.chintangal@gmail.com> wrote:
Hello,

I am a student and I am thinking of getting myself more involved in the tor project over the winter break.

Previously, I  worked briefly on the tor-weather rewrite project which eventually turned into an gsoc project in March 2014.

Are there any projects that are in need of a volunteer? I am well versed in C, Python and Java (Android).

Cheers!
--
Abhiram Chintangal