Smultron is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The best Windows alternative is Visual Studio Code, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to Smultron and many of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Smultron are Notepad++ (Free, Open Source), Sublime Text (Free Personal), Vim (Free, Open Source) and VSCodium (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.
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.
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.
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).