Switch between Zoho Products?

Switch between Zoho Products?

Hi Team!

I have been playing around with Zoho CRM, Campaigns, and now Invoice.  Is there a quick way to switch to the various products?  Or even better, is there a way to integrated them onto one screen?  As I am still testing the various Zoho programs out I only have the free versions of the aforementioned products, is this type of thing only available for the paid versions?

Thanks!

Bob Kirkland