Nope, but the OS is open source so you could try getting it to work yourself: https://github.com/pebble-dev/pebble-firmware
> This is the latest version of the internal repository from Pebble Technology providing the software to run on Pebble watches. Proprietary source code has been removed from this repository and it will not compile as-is. This is for information only.
edit: not sure they use the proprietary stack... at the very least, it looks like they're in the process of switching to a free BT stack
How are you supposed to do that?