Top 3 Open-Source Alternatives to FocusOKR

OKR Software Tools helps you set objectives, track key results and align people and goals together to achieve remarkable progress and profits for your company

Habitica is a free habit building and productivity application.

The new task app from the team that brought us Wunderlist, Microsoft To-Do is a great way to manage tasks. List everything you need to do—or import tasks from Outlook, Todoist, and Wunderlist so you don't have to start over.