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.
Invoicy.io - Free invoice generator
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Serverless Invoices - Free, serverless invoice generator - open sourced
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
TimeFlip - Human-friendly time tracker