FreshBooks - The ideal accounting software for small business owners.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Avaza - Beautiful Projects, Timesheets, Expenses, Quotes & Invoices for Small Businesses
Bill4Time - Your Complete Time and Billing Solution. Simplify your billing. Recover lost revenue.
Moon Invoice - Free Invoice Generator App - Easy Invoicing Software - Fast Mobile Invoicing App
Active Collab - Active Collab — Task management, Team collaboration, Time tracking & Invoicing app