The best alternatives to Begin are Trello, Talla the Task Assistant, and Wanna. 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 Originally made by Fog Creek Software in 2011, it was spun out to form the basis of a separate company in 2014 and later sold to Atlassian in January 2017.
Where do you write down all the things you want to do, not the things you have to do? The TV shows friends tell you to watch, books you've been meaning to read, cities you want to visit, or coffee shops you've been meaning to try.... we didn't have a good answer, so we created Wanna, an app to track your life's "wannas".