BenBen

“Your mind is for having ideas, not holding them.” – David Allen (source)

BenBen frees your mind of having to remember things you need to do. It's,

text-based
easy to learn
~~FAST~~ SUPER FAST to use 👍

All you need to do is,

download it from here.
double-click it.
add your tasks.
let it manage your tasks for you

And it is FREE!

Features:

Managing tasks
Managing deadlines (coming soon)
Reminders (coming soon)

If you Java programmer, you can use it to practice Java too. Here's the main method:

public class Main {
    public static void main(String[] args) {
        Application.launch(MainApp.class, args);
    }
}