Test task is my flagship program. It's intended to replace calendar apps as your main source of daily task completion. The goal of this program is to organize your tasks into priority queues and display different tasks as priorities through out the day depending on when the task was set to be a priority. The expectation is that you don't need to get to a task now, but you should eventually get to the task and when it's a priority is the ideal time to do so. But, if you can't or don't when it's a priority the task remains available to be completed in a lower priority queue. The tool offers many features to help make organizing tasks for your day less tedious than a standard calendar app as well as many features unique to it like events, long term task management, and groups.
It is the best task app on the android market.