Open-source time-tracker like oDesk

Unfortunately the open-source options will not prompt. Of existing devices for one time use.
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\rwww.tahometer.com/ — For more than 1 user and more than 1 project paid. The main plus client under linux.
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Found a suitable option — toggl.com
Have 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.

Hint. Register for your free account tahometer.com send email to info@tahometer.com stating your username and request to become a beta tester and get a commercial account with offline time, and user.

He asked search and looked above proposal and yet stopped for I found may not opensourc of course but with screenshots, free version up to two partners and pay not expensive screenshotmonitor.com