XML Notepad is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is Vim, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to XML Notepad and 17 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to XML Notepad are Geany (Free, Open Source), GNU Emacs (Free, Open Source), CudaText (Free, Open Source) and UltraEdit (Paid).
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).
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).
Enki is a text editor for programmers. It is: –User friendly. Intuitive interface. Works out of the box. You don’t have to read a lot of docs -Hacker friendly. Code as quickly as possible. Without mouse.