What is the difference between Zoho CRM and Zoho CRM plus?

What is the difference between Zoho CRM and Zoho CRM plus?

Zoho CRM is a stand alone product available in four different editions. Pricing for CRM varies based on the edition you choose. Take a look at the pricing here.
CRM Plus is a bundle of nine products that includes CRM, Desk, Projects, Sales IQ, Campaigns, Analytics, SalesInbox, Social, and Survey each available as their enterprise or highest edition. CRM Plus has a fixed pricing model at $69/user/month billed monthly or $57/user/month billed annually.