Package msynctool

Calendar (and other PIM data) synchronization program

http://www.opensync.org

msynctool is a program to synchronize calendars, addressbooks and other PIM
data between programs on your computer and other computers, mobile devices,
PDAs or cell phones.
For proper use, please install the desired plugins found in the
libopensync-plugin-* packages.

General Commands (Section 1)
convcard
It converts a vCard version 2.1 in a vCard version 3.0 and vice versa. By default the source file format is autodetected, and is converted to the other format...
msynctool
Command line interface for OpenSync You can use this tool to synchronize your devices and applications using the OpenSync framework from the command line.