/tap

/tap is a massively powerful and totally customizable note-taking system. Like a blank notebook, its strength comes from its simplicity. With a few special tools, you can build any note-taking system you can imagine, complete with methods to track, organize, and visualize your ideas.

/tap can even be programmed to interact with you. Send prompts or reminders (i.e. What did you do today? or Remember to take your vitamins) or email yourself a periodic digest of your notes.