The best open source alternative to UltraEdit is Notepad++, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to UltraEdit and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to UltraEdit are Atom (Free, Open Source), Vim (Free, Open Source), Eclipse (Free, Open Source) and VSCodium (Free, Open Source).
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Atom vs UltraEdit opinions
Some users think Atom is a great alternative to UltraEdit, some don't.
UE's big win is that it's a column based text editor. NOT an SDK. Nearly all text editors listed here are actually SDKs. Either that or they're just the usual suspects.
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.