Simple Notes Taking & Organizer is described as 'A simple, easy-to-use Notes Taking & Organizer program for Windows® Computers. It supports unlimited Notes and Unlimited Organizing Categories (1-Level)' and is an app in the Office & Productivity category. There are more than 100 alternatives to Simple Notes Taking & Organizer for a variety of platforms, including Windows, Mac, Linux, BSD and Online / Web-based. The best alternative is Notepad++, which is both free and Open Source. Other great apps like Simple Notes Taking & Organizer are Atom (Free, Open Source), Sublime Text (Free Personal), Vim (Free, Open Source) and gedit (Free, Open Source).
GNU nano is a small and friendly text editor. Besides basic text editing, nano offers many extra features like an interactive search and replace, go to line and column number, auto-indentation, feature toggles, internationalization support, and filename tab completion.
The Kate project develops two main products: KatePart, the advanced editor component which is used in numerous KDE applications requiring a text editing component, and Kate, a MDI text editor application.
CudaText is a cross-platform text editor, written in Lazarus. It starts quite fast (0.5 sec with ~30 plugins on CPU Intel Core i3 3Hz). It is extensible by Python add-ons (plugins, linters, code tree parsers, external tools).