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.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Qbserve - Freelance time tracking, invoicing, and productivity improvement
doo - A smart, simple app for reminders and to-dos
Bonsai - One platform to streamline your entire business
Laverna - Laverna is a JavaScript note taking application with Markdown editor and encryption support.