Yep, I really expected something like Anki, but for tasks. I wonder if you could hack the Anki engine for that - you have a list of things you'd like to semi-regularly get to but you can't prioritise it and you can't schedule it always at the same hour every day. So you can take out your phone, tap "I am free now, what should I do?" and get a task to do now. With time the engine will learn the approximate time each task takes and how much time you can devote per day, so it should be able to schedule your ongoing tasks more or less optimally. You could couple that with the standard calendar so you won't get a time-consuming task right before an appointment.
How I envision this would work: You want to read a specific book, practise german, contribute to two specific f/oss projects and watch jackie chan's entire filmography. You put in 5 tasks: "book", "german", "oss A", "oss B" and "jackie chan". The engine will select one at semi-random when you indicate you're free to do it and track how much time you spend on it. Some tasks can additionally have percentage completions associated with them - you can say how much of the book you've read and how many movies you've watched, but the other three are ongoing without a clear goal. So it will try to make sure you spend equal time on ongoing tasks, while making equal progress on ones with a clear goal.
(Disclaimer: This idea is Free. Please take it and build this software. I would, but I can't plan my time efficiently to do it. Or as Pooh would say: I know I can think of a better way to get down the stairs, but not while bumping my head in them)
How I envision this would work: You want to read a specific book, practise german, contribute to two specific f/oss projects and watch jackie chan's entire filmography. You put in 5 tasks: "book", "german", "oss A", "oss B" and "jackie chan". The engine will select one at semi-random when you indicate you're free to do it and track how much time you spend on it. Some tasks can additionally have percentage completions associated with them - you can say how much of the book you've read and how many movies you've watched, but the other three are ongoing without a clear goal. So it will try to make sure you spend equal time on ongoing tasks, while making equal progress on ones with a clear goal.
(Disclaimer: This idea is Free. Please take it and build this software. I would, but I can't plan my time efficiently to do it. Or as Pooh would say: I know I can think of a better way to get down the stairs, but not while bumping my head in them)