Open Source Mobile Phone Platforms

I am looking for a good Open Source Mobile Phone Platform and these ones seem like the one with most of the momentum:

• Google Android (Apache license)
  
• Nokia Maemo (Partial Open Source and Proprietary)

The future of open source in mobile phone platforms is good as the main current platforms (Google Android, iPhone and Symbian) use really important open source components like WebKit and SQLite.

Let's hope for a future OSS platform for Mobile Phones like there currently is with distributions like Ubuntu