SourceKit is described as 'A Textmate like lightweight programmer's text editor right inside of Chrome. It saves files directly to Dropbox, so if you have the Dropbox sync software installed, the changes will appear locally as if you did so with a text editor!' and is an app in the Development category. There are more than 100 alternatives to SourceKit for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and BSD. The best alternative is Visual Studio Code, which is free. Other great apps like SourceKit are Notepad++ (Free, Open Source), Atom (Free, Open Source), Vim (Free, Open Source) and Eclipse (Free, Open Source).
VS Code is more than just a code editor, it provides the tools and extensions to compile, debug, compare, refactor, and even manage code repositories all within a highly-customised development environment.
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.