Notes is described as 'Use Notes to capture a quick thought, create checklists, sketch ideas, and more. And with iCloud, you can keep your notes up to date across all your devices' and is an app in the Office & Productivity category. There are more than 100 alternatives to Notes for a variety of platforms, including Windows, Mac, Android, iPhone and Online / Web-based. The best alternative is Joplin, which is both free and Open Source. Other great apps like Notes are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Evernote (Freemium).
Passfindr is a web based premium Personal knowledge base, Password manager and Bookmark manager application to securely store passwords and other sensitive information in a virtual vault locked with individual master passwords.
notin helps you in reminding things you need to do, random numbers you do not want to save in your contacts and many more through the help of Notifications. The reminder doesn't pop-up or rings, it just sits there and still does it's job most efficiently.
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.
QuickNote is a .txt and .rtf note editor and organiser. It does not use a database; instead, notes are saved as separate files. So one can access them with windows explorer. It shows all the subfolders under the working directory as nodes and subnodes in a tree-view pane.