KDE’s Kate on all platforms
 

Kate, KDE’s programming-focused text editor, is, of course, a Qt application, and is also available on a variety of other platforms. Christoph Cullmann, one of the developers of Kate, published a short blog post with screenshots of Kate running on the three biggest platforms – Linux/BSD, Windows, and macOS. Sadly, while Haiku gets a mention, there’s no screenshot of the Haiku version of Kate.

https://www.osnews.com/story/139281/...all-platforms/