AtoZ Notebook is described as 'simple, password protected Data Manager. It has about as much complexity as a pen and paper and can be used to store website logins, names and addresses, and anything that fits the A - Z model. All protected by a single password' and is an app in the Office & Productivity category. There are more than 10 alternatives to AtoZ Notebook for a variety of platforms, including Windows, Mac, Android, iPhone and iPad. The best alternative is Simplenote, which is both free and Open Source. Other great apps like AtoZ Notebook are recordando (Free, Open Source), NoteAway (Free), UpNote (Freemium) and Tot (Freemium).
recordando (Spanish for remembering) is a program in which to keep your written thoughts This space has these characteristics: It presents a simple organization on screen (like post-it notes) It's safe and secure; it runs on your own computer and not on the Internet ...
NoteAway is the simplest, most convenient way to take quick notes on OS X. NoteAway has lots of powerful features for free, like iCloud syncing, rich text, attachments, simple import/export, and a variety of customizable options.
TakeNote was made by developers for developers - a simple, plain-text note-taking app for the web with Markdown support. What you see is what you paste. No WYSIWIG, no formatting pasted from the web, and no features you don't need or want.