OpenSync (software)
OpenSync is a software library framework used for synchronization of PIM data (contacts, calendar, tasks, and notes) between personal computers and mobile devices. It is derived from MultiSync. OpenSync is plugin based and its product-specific plugins allow support for a wide variety of different synchronization endpoints (PIM applications, mobile phones, personal digital assistants, groupware servers, and Lightweight Directory Access Protocol (LDAP) directories). Its design and implementation would allow other synchronization uses as well.
OpenSync has been selected to be KDE's main synchronization framework. It is cross-platform software that can be run on Microsoft Windows and various Unix-like systems, including Linux and Mac OS X.
OpenSync is free and open source software, released under the terms of the GNU Lesser General Public License.
Read more about OpenSync (software): Features, Supported Platforms, Supported Devices, Plugins, Current Status