RichEdit is described as 'Lightweight, handy and useful text editor which allows you to create, open, and save files using both the Rich Text Format and the Plain Text Format. Vikon has all the features of an advanced text editor' and is an app in the Development category. There are more than 50 alternatives to RichEdit for a variety of platforms, including Windows, Linux, Mac, BSD and Chrome OS. The best alternative is Notepad++, which is both free and Open Source. Other great apps like RichEdit are Atom (Free, Open Source), Sublime Text (Free Personal), Geany (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.
Bluefish is a powerful editor targeted towards programmers and webdesigners, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages, and it focuses on editing dynamic and interactive websites.
Pinegrow is a Mac, Windows and Linux web editor that lets you build responsive websites faster with live multi-page editing, CSS & SASS styling, CSS Grid editor and smart components for Bootstrap, Foundation and WordPress.