Redcar is described as 'text editor for programmers written in Ruby. At the moment, it’s a young enough project that it is mainly of interest to Rubyists who want to use Ruby to script their editor' and is an app in the Development category. There are more than 25 alternatives to Redcar for a variety of platforms, including Mac, Windows, Linux, BSD and Haiku. The best alternative is Visual Studio Code, which is free. Other great apps like Redcar are Atom (Free, Open Source), Vim (Free, Open Source), VSCodium (Free, Open Source) and gedit (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.
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).
TextMate brings Apple's approach to operating systems into the world of text editors. By bridging UNIX underpinnings and GUI, TextMate cherry-picks the best of both worlds to the benefit of expert scripters and novice users alike.
ReText is a simple text editor for Markdown and reStructuredText documents with syntax highlighting and optional live preview. It is written in Python using Qt libraries, able to run on any platforms (Linux and BSD are officially supported).