Windows Mobile
smartWatchM.cab v1.2.5.2 (20100103)
smartWatchM-st.cab v1.2.5.1 (20091213) - use in case of heavy battery drain (HTC Advantage, Universal), MS BT stack only
smartWatchMToday.cab v0.1.0 (20090315)

Windows
OpenWatch v0.1.0.4 (32 bit/64 bit) (20100110)

Android
OpenWatch for Android v0.5.0 (20100128)

BlackBerry
OpenWatch for BlackBerry v0.1.7.3 (20100127)

J2ME
OpenWatch DEMO v0.1.0 (20090819)
Rockola BT v1.1.0 (20090819)

PalmOS
OpenWatch for PalmOS v0.1 (20091219)

Linux
OpenWatch.py v0.1 (20091220)
OpenWatch.py v0.1 (20091220) - no media keys

Maemo
OpenWatch v0.3.0 (20100206)

Symbian
-

Bada
?

Mac OS
?

iPhone
Currently not possible

webOS
Currently not possible