Cambridge Online links to many websites of organisations and businesses in Cambridge. These are divided into groups - see the buttons on the left for categories. This is one way to find what you want.
However, the database is also listed in alphabetical order on this page:
Database of Cambridge Online
This means that you can look up a name directly. You can also search the page for names or descriptions. In Internet Explorer, click on 'Edit' (top of screen) then 'Find on this page'.