InSync
A Sync4j 1.2 module which provides a vCard and vCalendar parser, MySQL database implementation and HTML front end.
There are a number of known bugs, the worst being the duplication of entries upon initial creation. Currently, the database settings must be hard coded as JDBC strings within the database classes.
While I suspect the module will work with Sync4j 2 with only a few minor alterations, I have yet to attempt it.