Suvichar Technologies, Zoho Alliance Partner has developed Xero and 1ShoppingCart inegrations to ZOHO CRM.

Xero - Xero comes with fantastic features within Online Accounting, Automated Banking and Invoicing
1ShoppingCart - 1ShppingCart comes with eCommerce features like Shopping Cart, Shipping Options, Payment Processing, Ad and Email Campaigns and others

So if you are a user of both Zoho CRM and Xero then you will be able to 

• Sync Zoho Accounts with Xero Customers
• Sync Zoho Invoices to Xero Invoices
• Automatic updating of Zoho CRM Invoices when Xero Invoices are updated
• Configure this sync utility as a recurring cron job

ZOHO CRM Features Overview:

• Sales and Marketing - Zoho CRM aligns your Sales and Marketing by integrating sales with campaigns, web forms, leads, sales pipeline, forecasts, etc.
• CRM with Email - Track all your customers email correspondence inside Zoho CRM. You don't need to CC or BCCemails to a particular email address.
• Inventory Management - Zoho CRM empowers you to complete the post-sales activities with an integrated inventory management system.
• Extensive Product Customization - Drag-and-drop UI tools and custom fields tocustomize Zoho CRM as per your business process.
• Role Based Security - Zoho CRM empowers you to control the CRM data access based on users' job role in your organization hierarchy.
• Third Party Integration - Developer API for integrating Zoho CRM modules with third-party business software, such as accounting, ERP, etc.
• Reports and Dashboards - Zoho CRM helps you to analyze sales & marketing trends and key CRM metrics by reports and dashboards
• Plugin To Office and Outlook - Improve business productivity by synchronizing contacts and creating mail merge docs.

Apart from above features ZOHO CRM also comes with add-ons and integrations with ZOHO's own prdoucts. For more information visit ZOHO.