On the 30th of November 2013 the final version 2.1.1 of Z-Push was released.
The changelog is available.
You can download it here.
For development/unstable/svn versions, please check the Z-Push download page.
Z-Push is an implementation of the ActiveSync protocol which is used 'over-the-air' for multi platform ActiveSync devices, including Windows Mobile, iPhone, Android, Sony Ericsson and Nokia mobile devices. With Z-Push any groupware can be connected and synced with these devices.