Sage One Online Accounting & Invoicing Software [Download] Entrepreneur-Friendly Accounting: automate you income and expense tracking, know where your money is being spent and where you can cut back Painless Invoicing: Select your branded invoice template, add the tracked time for completed tasks, and send an accurate invoice to your customers from Sage One Easy Project & Task Management: Invite anyone to work with you, assign tasks, share ideas, files, status updates and feedback