OpenGroupware.org
SourceCode
OpenGroupware.org is written in objectiv-c
scheduler
postgres db:
date_company_assignment date_info date_x
tables/orientation
as you can see in opengroupware things are framed together for example when you add a new appointment some fields are framed together. almost every frame has it's own table in the database
(better keep this wiki subsite in english since most developers are from all over the world and users normally don't get in touch with all that stuff)