I've been trialing the Things app recently. Pressing F12 anywhere, even when using some other app, pops up a window where you can quickly add a todo. When you'r

I've been trialing the Things app recently. Pressing F12 anywhere, even when using some other app, pops up a window where you can quickly add a todo. When you're doing something else, and suddenly remember something you might want to do later, it's very easy to store it. When you have the popup open it has shortcut keys for associating it with a certain project or date. If you're in a hurry, you can skip that and move it to the proper place later. Because of the shortcut and being able to organize later, it's completely effortless to note something. Everything you add shows up on your phone as well, so it's really convenient for taking notes around a topic and not forgetting stuff. You can have daily repeating tasks too, which are nice for habit-building.