QTodoTxt is a fast, cross-platform to-do list GUI written in Python. It has many features, such as automatically recognizing hyperlinks that start with http, https, or ftp, automatically sorting tasks by priority and alphabetically, and displaying due dates in the format "due:YYYY-MM-DD" with red for today or past, orange for within the following week, and black for more than one week.
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A free program for Mac, by Pocket Bits LLC.
