group calendaring solution

Hello Everyone
  I am looking for a group calendaring solution on
openlaszlo, Does 
anyone have  a well built calendaring solution,( events + 
task Manager 
)  or anything related.
  I need something similar to googleCalendar.
 I will be thankful for any type of suggestions. 

Thank in advance
Daljeet Singh
skype ID : daljeet.gandhi