JCAT  This is probably the most-used tool I have because it's so very simple to access from the desktop tool bar,so versatile and flexible in the way it lets me create even more new notes or add to (or edit) existing ones, so adaptable to anything I want to put into it and anything I want to take out of it. If I create a new user-name and password, I have an immediate place to store them before I forget them (goodbye, all you scattered notes across the desk!), if I suddenly think of something urgent, I can make a note without having to shift away from whatever I'm working in, if I need to keep track of which apps are on trial for how long and at what final cost--Jotter is there!

Editing a doc and think of what needs to be done in another section or another doc? Jot your idea. Never leave your work.

Have to stop editing a photo but know what your next steps should be? Jot them while you're still looking at your photo and program.

Incoming info you need to keep and access? Jot it without stopping what you're doing.

Jotter makes the other note-taking apps seem . . . well, klutzy.

Have I mentioned that I really like Jotter?  
(Version 1.4.1)

JCAT  I got this by accident as part of a MacBundle containing two other apps I needed, but I have used it thankfully every morning since. I have an odd schedule; Aurora lets me set a different wake-up time for each day, and a separate playlist so that before my eyes open I know what day this is. Marvelous! It doesn't help my computer run better nor my workflow lessen, but it certainly improves my mood! No alarms, no depressing news, no extra-loud radio ads--just music of my choice.  
(Version 4.0.10)