Best personal information managing app

Question

I am looking for an app

• ability to write some to-do and categorise it
• ability to write some general information like a paragraph of notes and categorise into different category like Opinion,Observation,financial log
• ability to schedule the schedule a task

Basically the app has to be my companion.

Any ideas

Answer 1

Zim Wiki with its Task List Plugin. You can use Zim can be used in several different ways (Daily Journal, Getting Things Done, Creative Writing). For to-do entries you can create checkboxes, and set tags for them, and when you open Task List window, you can filter tasks by tags.

Edit:

You can set priority for task using "!" symbol. More "!" sybols = higher priority.

Look at this usage scenarios.