Found a suitable option —
toggl.comHave the ability to manage time tracker via web interface, and with the help of clients under Win, Max, Lin, iPhone, Droid!
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What we liked — when you start the time counter for a task in the browser, quit the browser and working with the "desktop" version of the counter continued to count as soon as the desktop client connected to the network. And the countdown is on the server side, this means that there is no reference to any device.