1. Quickbooks for accounting.
2. Amazon Web service for web hosting.
3. Basecamp for project management.
4. Gmail for free web-based email service.
5. Google analytics to analyse your website’s traffic.
6. Salesforce.com for Customer relationship Management.
7. Evernote for note making.
8. Mailchimp as a email marketing tool.
9. DropBox for sharing files and folders with your contacts.