KosmoTime - The to do list with super powers

Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.

Cron - Cron Calendar.

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.

Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.

Daily Time Tracking - Daily shows what you have been working on and for how long. It creates accurate timesheets by asking what you are doing, so no more timers or switching tasks. Use its data to submit your hours, create invoices or simply increase your productivity.