VoxForge
Google Android has its own speech recognition engine, which is used by their application VoiceDialer.
You can check out the code on http://source.android.com/download
It is licensed in apache license, which is compatible with GPL.
Hi Dano,
Very cool! Thanks for the update.
Here is the link to the GIT source viewer for the VoiceDialer application in the Android repository: http://git.source.android.com/?p=platform/packages/apps/VoiceDialer.git.
For those interested in looking at the source for the Speech Recognition engine, here is the link: http://git.source.android.com/?p=platform/external/srec.git.
Ken