Xero - Xero is online accounting for your small business.
keap.com - Grow Sales. Save Time. Get Organized.
QuickBooks Online - QuickBooks Online is a Cloud Accounting for small business that can be used on iPad, mobile phone or computer to do invoicing, billing, run reports, or even pay employees online.
HubSpot CRM - Free CRM software for small businesses.
Sage One - Nothing should get in the way of building your dream business. Least of all complexity.
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.