Todoist turns your browser into the ultimate to-do list and task manager.

http://todoist.com/web

Producteev is one of the world’s leading Task Management platforms for teams. With an intuitive, easy to use, interface and apps that make your to-do list accessible anywhere, Producteev is helping hundred of thousands of teams collaborate in an efficient way.

https://www.producteev.com/

http://www.getsoloapp.com/