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.
Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.