The best alternatives to Ollert are Trello, Screenful for Trello, and Fero. If these 3 options don't work for you, we've listed a few more alternatives below.
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Trello is a web-based Kanban-style list-making application. Originally made by Fog Creek Software in 2011, it was spun out to form the basis of a separate company in 2014 and later sold to Atlassian in January 2017.