HP/Palm have posted the opensource packages for download according to the version you may need and the pdf open source information file:
Open Source PackagesWe are pleased to provide the source code of various open source components used in webOS. Please choose the release number of webOS to be redirected to the appropriate download page.
Open Source Information FileThere are two ways to view the Open Source Information file on the Palm Pre device.
1) You can view the Open Source Information on your device:
2) You can also view the file on your computer:
Downloading the Latest Version of the Open Source Information File
The latest version of the Open Source Information file is also available for download from this site. Click here to download.