I would like to create a website. It should have 1) two types of user accounts (e.g. buyer account and seller account), 2) good searching functions based on data created by buyer or seller or google map, 3) own calendar functions (being able to link to other calendars, such as google calendar), 4) multi-languages, e.g. English and Dutch, and 5) a good security system. The website should be potentially fitted to android or iOS devices (cellphones or tablets).