What's OneTask.com windows alternative - you can boost productivity 1000%

Hi,
I am looking for a windows based alternative to OneTask.com tool which increased my productivity A LOT during previous work. By now I am operating windows OS and look for something similar to run inside Win.

Basically what this tool does is it shows you only one task at a time in front of you during work. I discovered that long to-do list can be scary and doesn't motivate at all and this tool help you become focused and stay focused for a long time. Tested.

Anyone know any windows alternative or similar web based tool which do the same?

Pomodoro timers work great for our team, as simple as they are. We use timers coupled with an Evernote setup similar to www.thesecretweapon.org setup.