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OKRs.app - Reach your personal goals with OKRs
Things - Things is an easy to use task manager.
OKRStudio - Connect Trello cards to OKRs. Manage OKRs inside of Trello
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Weekdone - Market leader and innovator since 2013. Set structured quarterly goals, keep track of activities, and focus on getting real business results. Track weekly progress, provide feedback, and move everyone in a unified direction.